wpsnoop Fatal error: Cannot redeclare idn_to_utf8()

If you are dealing with a WordPress issue where a PHP Function idn_to_utf8() was already declared it is most likely due to a plugin/theme conflict.

wpsnoop scanned and analyzed over 100,000 WordPress plugins and themes to find and locate potential conflicts including functions that share the same name.

This page has information on the 104 places where that function is declared and used in WordPress plugins and themes.

Note: Our database currently only taps into the free themes and plugins available in the publicly available WordPress plugins and themes, if your site uses paid plugins, themes or custom code there may be additional conflicts.


Our database has uncovered 104 different instances of potential conflicts where different plugins or themes share the function name.

Examples of this error include:

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/wp-bullhorn-staffing/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin WP Bullhorn Staffing and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/novinhub/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Novinhub and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/blossomthemes-email-newsletter/vendor/symfony/polyfill-intl-idn/bootstrap.php:136)

This file is part of the WordPress plugin BlossomThemes Email Newsletter and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/open-web-analytics/vendor/symfony/polyfill-intl-idn/bootstrap.php:56)

This file is part of the WordPress plugin Open Web Analytics and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/goauth/vendor/symfony/polyfill-intl-idn/bootstrap.php:56)

This file is part of the WordPress plugin GOAuth and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/ap-sms-manager/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin AP SMS Manager and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/vstack/vendor/symfony/polyfill-intl-idn/bootstrap.php:136)

This file is part of the WordPress plugin vStack and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/catenis-api-client/thirdparty/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Catenis API Client for WordPress and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/cloudflare/vendor/symfony/polyfill-intl-idn/bootstrap.php:136)

This file is part of the WordPress plugin Cloudflare and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/qr-code-payment/vendor/symfony/polyfill-intl-idn/bootstrap.php:54)

This file is part of the WordPress plugin QR Code Payment and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/simply-schedule-appointments/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Simply Schedule Appointments and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/promo-video-maker/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Promo Video Maker and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/automater-pl/vendor/symfony/polyfill-intl-idn/bootstrap.php:56)

This file is part of the WordPress plugin Automater and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/wc-transbank-webpay-plus/vendor/symfony/polyfill-intl-idn/bootstrap.php:128)

This file is part of the WordPress plugin Integración de Webpay Plus de Transbank para WooCommerce and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/digiwallet-for-woocommerce/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin DigiWallet for WooCommerce and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/mapado-events/vendor/symfony/polyfill-intl-idn/bootstrap.php:131)

This file is part of the WordPress plugin Mapado for Wordpress and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/xcloner-backup-and-restore/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin XCloner - Site Backup and Restore and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/nomore404-404-redirection-and-firewall/includes/aws/Symfony/Polyfill/IntlIdn/bootstrap.php:132)

This file is part of the WordPress plugin NoMore404 404 Redirection and Firewall and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/xcloner-google-drive/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin XCloner Google Drive and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/cardinity-free-payment-gateway-for-woocommerce/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Cardinity Payment Gateway and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/ssl-atlas-free-ssl-certificate-https-redirect/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin SSL Atlas - Free SSL Certificate & HTTPS Redirect and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/altapay-for-woocommerce/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Altapay for WooCommerce - Payments less complicated and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/cardinity-gateway-for-easy-digital-downloads/vendor/symfony/polyfill-intl-idn/bootstrap.php:136)

This file is part of the WordPress plugin Cardinity Gateway for Easy Digital Downloads and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/wp-mail-gateway/vendor/symfony/polyfill-intl-idn/bootstrap.php:56)

This file is part of the WordPress plugin WP Mail Gateway and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/quick-login/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Quick Social Login and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/tamara-checkout/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Tamara Checkout and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/wesecur-security/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin WeSecur Security and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/subscribe-to-category/vendor/symfony/polyfill-intl-idn/bootstrap.php:136)

This file is part of the WordPress plugin Subscribe to Category and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/mediavine-create/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Create by Mediavine and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/wc-vimeo/vendor/symfony/polyfill-intl-idn/bootstrap.php:54)

This file is part of the WordPress plugin Video Sales for Woocommerce with Vimeo and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/shopping-feed/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin ShoppingFeed and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/ssl-zen/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin SSL Zen - Free SSL Certificate & HTTPS Redirect for WordPress and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/hivepress/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin HivePress and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/global-seller-services-for-woocommerce/vendor/symfony/polyfill-intl-idn/bootstrap.php:136)

This file is part of the WordPress plugin Global Seller Services for WooCommerce and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/sync-qcloud-cos/cos-sdk-v5/vendor/symfony/polyfill-intl-idn/bootstrap.php:136)

This file is part of the WordPress plugin Sync QCloud COS and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in phar://wp-content/plugins/c3-cloudfront-clear-cache/libs/aws.phar/Symfony/Polyfill/Intl/Idn/bootstrap.php:132)

This file is part of the WordPress plugin C3 Cloudfront Cache Controller and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/auto-post-woocommerce-products/admin/vendor/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Auto Post WooCommerce Products and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/ilab-media-tools/lib/mcloud-symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Media Cloud and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/tencentcloud-captcha/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin tencentcloud-captcha and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/tencentcloud-cos/includes/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin tencentcloud-cos and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/tencentcloud-ims/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin tencentcloud-ims and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/tencentcloud-sms/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin tencentcloud-sms and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/tencentcloud-tms/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin tencentcloud-tms and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/tencentcloud-vod/vendor/symfony/polyfill-intl-idn/bootstrap.php:136)

This file is part of the WordPress plugin tencentcloud-vod and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/moovly/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Moovly and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/my-chatbot/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin My Chatbot and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/all-in-one-performance-accelerator/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin All-in-one Performance Accelerator and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/gianism/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Gianism and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/outshifter-export/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Outshifter export and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/ahrefs-seo/vendor-prefixed/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Ahrefs SEO and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/backwpup/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin BackWPup and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/spatialmatch-free-lifestyle-search/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin SpatialMatch IDX and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/tides-today-uk-ireland-tide-times/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Tides Today UK and Ireland Tide Times and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/mpl-publisher/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin MPL-Publisher and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/lat-affiliate-tool/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin LAT Affiliate Tool and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/mplus-intercom-subscription/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Mplus Intercom Subscription and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/wc-paypay-gateway/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Payment Gateway PayPay for WooCommerce and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/cf7-creamailer-extension/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Contact From 7 Creamailer Extension and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/forms-by-made-it/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Forms and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/qbank-dam-connector/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin QBank Connector and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/dreamobjects/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin DreamObjects Backups and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/thebooking/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin TheBooking and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/easy-caller-with-moceanapi/lib/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Easy Caller with MoceanAPI and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/woo-payment-gateway-paysera/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin WooCommerce Payment Gateway - Paysera and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/uploadcare/vendor/symfony/polyfill-intl-idn/bootstrap.php:136)

This file is part of the WordPress plugin Uploadcare File Uploader and Adaptive Delivery and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/uss-upyun/sdk/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin USS Upyun and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/grid-social-boxes/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Grid Social Boxes and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/transferito/aws/Symfony/Polyfill/Intl/Idn/bootstrap.php:132)

This file is part of the WordPress plugin WordPress Migration Plugin - Transferito and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/datacake-core/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Datacake CORE and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/mailpoet/vendor-prefixed/symfony/polyfill-intl-idn/bootstrap.php:123)

This file is part of the WordPress plugin MailPoet 3 (New) and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/miaoroom-toolbox/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Miaoroom ToolBox and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/gev-email-validator/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin GEV Email Validator and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/gitblock/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin gitblock — Github Block Plugin and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/easycontent/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin EasyContent and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/yaysmtp/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin YaySMTP - Simple WP SMTP Mail and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/extract-text-from-image-etfi/vendor/Symfony/Polyfill/Intl/Idn/bootstrap.php:132)

This file is part of the WordPress plugin Extract Text from Image - ETFI and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/aadp-amazon-affiliate-dropshipping-for-woocommerce/vendor/symfony/polyfill-intl-idn/bootstrap.php:136)

This file is part of the WordPress plugin AADP: Amazon Affiliate & Dropshipping for WooCommerce and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/wp-zoom/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Zoom for WordPress and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/landing-pages-app/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Landing Pages App and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/uv-b-connector-for-woocommerce/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin UV-B Connector for WooCommerce and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/wp-free-ssl/lib/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin WP FREE SSL - Free SSL Certificate for WordPress and force HTTPS and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/landingi-landing-pages/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Landingi Landing pages and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/cf7-mollie/includes/libs/vendor/symfony/polyfill-intl-idn/bootstrap.php:136)

This file is part of the WordPress plugin Contact Form 7 - Mollie extension and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/diffy/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Diffy and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/infinite-uploads/vendor/Aws3/Symfony/Polyfill/Intl/Idn/bootstrap.php:131)

This file is part of the WordPress plugin Infinite Uploads and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/wp-scheduled-posts/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin SchedulePress (Formerly Known as WP Scheduled Posts) and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/magic-conversation-for-gravity-forms/lib/vendor/symfony/polyfill-intl-idn/bootstrap.php:136)

This file is part of the WordPress plugin Magic Conversation For Gravity Forms and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/feed-social-sidebar/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Feed Social sidebar and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/rokka-integration/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Rokka Integration and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/imagex/sdk/vendor/symfony/polyfill-intl-idn/bootstrap.php:136)

This file is part of the WordPress plugin ImageX and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/visual-search/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Impresee CreativeSearch and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/gcs/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Google Cloud Storage plugin and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/hatenablog-auto-migration/vendor/symfony/polyfill-intl-idn/bootstrap.php:128)

This file is part of the WordPress plugin hatenablog-auto-migration and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/imagus/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Imagus and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/setka-editor/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Setka Editor and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/setka-workflow/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Setka Workflow and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/liverecover-woocommerce/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin LiveRecover for WooCommerce and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/wp-hamazon/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Hamazon and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/payvision-payment-gateway/payvision/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Payvision Payment Gateway and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/social-booster/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Social Booster and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/wpseobooster-adwords-keyword-planner/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Google AdWords Keyword Planner and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/salon-booking-system/src/SLN/Third/google-api-php-client/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Salon Booking Wordpress Plugin - Free Version and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/ultracart-ecommerce-shopping-cart/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin UltraCart WP and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare idn_to_utf8() (previously declared in wp-content/plugins/ameliabooking/vendor/symfony/polyfill-intl-idn/bootstrap.php:132)

This file is part of the WordPress plugin Amelia and could be interacting with another theme or plugin and causing a fatal error.

The error occurs because two (or more) plugins that you are using are both trying to declare a function with the same name.