wpsnoop Fatal error: Cannot redeclare is_woocommerce_active()

If you are dealing with a WordPress issue where a PHP Function is_woocommerce_active() 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 100 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 100 different instances of potential conflicts where different plugins or themes share the function name.

Examples of this error include:

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/integration-for-freeagent-woocommerce/index.php:1306)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/woocommerce-for-japan/woocommerce-for-japan.php:318)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/woocommerce-for-paygent-payment-main/woocommerce-for-paygent-payment-main.php:217)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/integration-for-otp-ebiz-woocommerce/index.php:1226)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/integration-for-szamlazzhu-woocommerce/index.php:2860)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/web-payment-software-payment-gateway-for-woocommerce/woo-includes/woo-functions.php:12)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/hungarian-pickup-points-for-woocommerce/index.php:1059)

This file is part of the WordPress plugin Hungarian Pickup Points & Shipping labels for WooCommerce and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/woo-smart-orders-page-free/woocommerce-smart-orders-page.php:35)

This file is part of the WordPress plugin WooCommerce Smart Orders Page FREE and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/woocommerce-gateway-amazon-payments-uk/woo-includes/woo-functions.php:12)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/woo-multistep-checkout/woo-multistep-checkout.php:19)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/48hr-turnaround-click-integration/woo-includes/woo-functions.php:12)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/digthis-quick-view-for-woocommerce/includes/woo-functions.php:13)

This file is part of the WordPress plugin Digthis Quick View For WooCommerce and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/wc-unzer-direct/woo-includes/woo-functions.php:12)

This file is part of the WordPress plugin Integrate Unzer Direct payment gateway with WooCommerce and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/woocommerce-geolocation-based-products/woo-includes/woo-functions.php:12)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/woocommerce-quaderno/woo-includes/woo-functions.php:18)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/bears-woocommerce-product-quick-view/i/bwc-functions.php:12)

This file is part of the WordPress plugin Bears WooCommerce Product Quick View and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/woocommerce-quickpay/woo-includes/woo-functions.php:12)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/blazing-woocommerce-shipment-tracking/bst-tracking-functions.php:18)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/master-addons/inc/classes/utils.php:325)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/woo-extended-settings/wc-extended-settings.php:49)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/woocommerce-recommendations-by-graphflow/woo-includes/woo-functions.php:12)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/woosplit-google-experiments-for-woocommerce/wc-google-experiments.php:22)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/schedule-product-delivery-date-for-woocommerce/schedule-delivery-for-woocommerce-products.php:21)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/woo-extra-product-options/woo-extra-product-options.php:18)

This file is part of the WordPress plugin Extra Product Options (Product Addons) for WooCommerce and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/claim-gst/claim-gst.php:13)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/woo-extra-variation-images/woo-includes/woo-functions.php:12)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/themehigh-multiple-addresses/themehigh-multiple-addresses.php:19)

This file is part of the WordPress plugin Multiple Shipping Addresses for WooCommerce (Address Book) and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/woocommerce-ripple-json-rpc/woo-includes/woo-functions.php:11)

This file is part of the WordPress plugin WooCommerce - Ripple (JSON RPC) and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/trackingmore-woocommerce-tracking/trackingmore-functions.php:6)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/woo-checkout-field-editor-pro/checkout-form-designer.php:18)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/product-support-for-woocommerce/wc-product-support.php:17)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/woocommerce-brand/main.php:27)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/add-fields-to-checkout-page-woocommerce/checkout-form-editor.php:55)

This file is part of the WordPress plugin WooCommerce Checkout & Account Field Editor and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/tricks-and-tweaks-for-woothemes-canvas/includes/woo-functions.php:12)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/wootrexle/woo-includes/woo-functions.php:12)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/themes/komenci/inc/template-functions.php:557)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/wooview/woo-includes/woo-functions.php:13)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/product-variation-swatches-for-woocommerce/product-variation-swatches-for-woocommerce.php:20)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/nexi-xpay-build/lib/woo-includes/woo-functions.php:109)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/linet-erp-woocommerce-integration/woo-includes/woo-functions.php:41)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/wcvn-one-page-checkout/onepagecheckout-for-woocommerce.php:37)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/woocommerce-stellar/woo-includes/woo-functions.php:13)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/woo-coolpay/woo-includes/woo-functions.php:12)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/graphflow-analytics/woo-includes/woo-functions.php:12)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/additional-order-costs-for-woocommerce/woo-includes/woo-functions.php:12)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/woo-cost-of-shipping/woo-includes/woo-functions.php:12)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/woocommerce-clover-payment-gateway/woo-includes/woo-functions.php:12)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/woocommerce-table-rate-currency-converter/woo-includes/woo-functions-custom.php:12)

This file is part of the WordPress plugin WooCommerce Table Rate Currency Converter and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/woo-addon-for-stripe/woo-includes/woo-functions.php:12)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/woo-addpay-gateway/woo-includes/woo-functions.php:12)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/asm-wc/woo-includes/woo-functions.php:12)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/woocommerce-mygate-virtual-payment-gateway/woo-includes/woo-functions.php:12)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/findshop/woo-includes/woo-functions.php:18)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/paypal-currency-converter-basic-for-woocommerce/functions.php:111)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/stampedio-product-reviews/woo-includes/woo-functions.php:18)

This file is part of the WordPress plugin Stamped.io Reviews & UGC for WooCommerce and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/woocommerce-upload-my-file/inc/umf-funct.php:10)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/wc-ciudades-y-regiones-de-chile/wc-ciudades-y-regiones-de-chile.php:29)

This file is part of the WordPress plugin MkRapel Regiones y Ciudades de Chile para WC and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/transactium-wallet-for-woocommerce/transactium-wallet-for-woocommerce.php:16)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/transactium-woocommerce-addon/transactium-woocommerce-addon.php:17)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/woo-payments-gateway-netevia/woo-netevia.php:28)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/woocommerce-order-product-count/woocommerce/woo-functions.php:12)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/wc-products-pack/wc_product_pack.php:45)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/woocommerce-order-search-by-transaction-id/woo-includes/woo-functions.php:12)

This file is part of the WordPress plugin WooCommerce Order Search by Transaction ID and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/woocommerce-order-searching/woo-includes/woo-functions.php:103)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/email-customizer-for-woocommerce/email-customizer-for-woocommerce.php:23)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/auctioninc-dhl-shipping-calculator-for-woocommerce/woo-includes/woo-functions.php:12)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/auctioninc-fedex-shipping-calculator-for-woocommerce/woo-includes/woo-functions.php:12)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/auctioninc-shippingcalc-for-woocommerce/woo-includes/woo-functions.php:12)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/auctioninc-usps-shipping-calculator-for-woocommerce/woo-includes/woo-functions.php:12)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/wip-woocarousel-lite/core/functions.wip-woocarousel-lite.php:19)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/wc-quick-view/woo-includes/woo-functions.php:12)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/cartasi-x-pay/lib/woo-includes/woo-functions.php:109)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/everypay-payment-gateway-for-woocommerce/woo-includes/woo-functions.php:13)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/wc-custom-thank-you/woo-includes/woo-functions.php:13)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/themes/logistico/inc/template-functions.php:556)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/woocommerce-zendesk-connect/inc/wzn-funct.php:19)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/mailpoet-woocommerce-add-on/woo-dependencies/woo-dependencies.php:8)

This file is part of the WordPress plugin MailPoet Checkout Subscription for WooCommerce - Legacy and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/product-batch-for-woocommerce/product-batch-wc.php:22)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/woocommerce-drop-shop/woo-includes/woo-functions.php:12)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/wc-donation-platform/wc-donation-platform.php:28)

This file is part of the WordPress plugin Donation Platform for WooCommerce: Fundraising & Donation Management and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/advanced-usps-shipping-calculator-for-woocommerce/woo-includes/woo-functions.php:13)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/sqid-payments-gateway-for-woocommerce/woo-includes/woo-functions.php:12)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/woo-pensopay/woo-includes/woo-functions.php:12)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/enhanced-ajax-add-to-cart-for-woocommerce/woo-includes/woo-functions.php:12)

This file is part of the WordPress plugin Enhanced AJAX Add to Cart for WooCommerce and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/wishlist-and-compare/wishlist-and-compare.php:36)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/bigboss-woocommerce-deposit-funds/woo-includes/woo-functions.php:12)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/paybox-payment-gateway/paybox-payment-gateway.php:39)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/woofunnels-woocommerce-nmi-gateway/woo-includes/woo-functions.php:13)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/role-wc/role-wc.php:192)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/tailor/includes/helpers/helpers-compatibility.php:102)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/vp-sign-documents-for-woocommerce/index.php:758)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/woo-shipping-tracker-customer-notifications/woo-shipping-tracker-customer-notifications.php:27)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/payday/payday.php:20)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/aftership-woocommerce-tracking/woo-includes/woo-functions.php:12)

This file is part of the WordPress plugin AfterShip Tracking - All-In-One WooCommerce Order Tracking (Free plan available) and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/woo-billingo-plus/index.php:2414)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/paydock-for-woocommerce/paydock-for-woocommerce.php:27)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/discount-and-dynamic-pricing/discount-and-dynamic-pricing.php:17)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/woo-preview-emails/includes/woo-functions.php:12)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/woo-download-credits/woo-download-credits.php:20)

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

PHP Fatal error: Cannot redeclare is_woocommerce_active() (previously declared in wp-content/plugins/registrations-for-woocommerce/woo-includes/woo-functions.php:12)

This file is part of the WordPress plugin Registrations for WooCommerce 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.