wpsnoop Fatal error: Cannot redeclare add_plugin()

If you are dealing with a WordPress issue where a PHP Function add_plugin() 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 32 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 32 different instances of potential conflicts where different plugins or themes share the function name.

Examples of this error include:

PHP Fatal error: Cannot redeclare add_plugin() (previously declared in wp-content/plugins/space-invaders/jump.php:33)

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

PHP Fatal error: Cannot redeclare add_plugin() (previously declared in wp-content/plugins/wp-fiddle/wp_fiddle.php:141)

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

PHP Fatal error: Cannot redeclare add_plugin() (previously declared in wp-content/plugins/stream-pandamolesto-shortcode/streamcodes.php:79)

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

PHP Fatal error: Cannot redeclare add_plugin() (previously declared in wp-content/plugins/bybrick-columns/bybrick-columns.php:134)

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

PHP Fatal error: Cannot redeclare add_plugin() (previously declared in wp-content/plugins/hustream-social-video/hustream.php:101)

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

PHP Fatal error: Cannot redeclare add_plugin() (previously declared in wp-content/plugins/perfect-columns/perfect-columns.php:124)

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

PHP Fatal error: Cannot redeclare add_plugin() (previously declared in wp-content/plugins/gpp-testimonials-widget/testimonials.php:261)

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

PHP Fatal error: Cannot redeclare add_plugin() (previously declared in wp-content/plugins/stockdio-historical-chart/stockdioplugin.php:1202)

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

PHP Fatal error: Cannot redeclare add_plugin() (previously declared in wp-content/plugins/essay-wizard-wpcres/wpcres-shortcode-dropdown.php:39)

This file is part of the WordPress plugin Essay Wizard (wpCRES) and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare add_plugin() (previously declared in wp-content/plugins/sequoia-sitelink/sequoia-sitelink.php:58)

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

PHP Fatal error: Cannot redeclare add_plugin() (previously declared in wp-content/plugins/svegliat-buttons/svegliat-buttons.php:522)

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

PHP Fatal error: Cannot redeclare add_plugin() (previously declared in wp-content/plugins/incredible-font-awesome/fontawesome.php:48)

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

PHP Fatal error: Cannot redeclare add_plugin() (previously declared in wp-content/plugins/stackerdecks-wp/stackerdecks_wp.php:47)

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

PHP Fatal error: Cannot redeclare add_plugin() (previously declared in wp-content/plugins/mind-doodle-sitemap/shortcode/shortcode.php:7)

This file is part of the WordPress plugin Mind Doodle Visual Sitemaps & Tasks and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare add_plugin() (previously declared in wp-content/plugins/tinymce-chinese-convert/tinymce-chinese-convert.php:50)

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

PHP Fatal error: Cannot redeclare add_plugin() (previously declared in wp-content/plugins/zohocreator/creatorForm.php:54)

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

PHP Fatal error: Cannot redeclare add_plugin() (previously declared in wp-content/plugins/toggle-box/toggle-box.php:46)

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

PHP Fatal error: Cannot redeclare add_plugin() (previously declared in wp-content/plugins/fupanet-widget-includer/fupanet-shortcode.php:74)

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

PHP Fatal error: Cannot redeclare add_plugin() (previously declared in wp-content/plugins/data-visualizer/data-visualizer.php:168)

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

PHP Fatal error: Cannot redeclare add_plugin() (previously declared in wp-content/plugins/fedex-ups-usps-parcel-tracking-system/fedex-ups-usps-tracking.php:687)

This file is part of the WordPress plugin Tracking FEDEX, UPS and USPS and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare add_plugin() (previously declared in wp-content/plugins/bibvenn-infoboks/bibvenn_infoboks.php:300)

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

PHP Fatal error: Cannot redeclare add_plugin() (previously declared in wp-content/plugins/calculate-mortgage/calculate-mortgage.php:207)

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

PHP Fatal error: Cannot redeclare add_plugin() (previously declared in wp-content/plugins/insert-adsense/insert-adsense.php:288)

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

PHP Fatal error: Cannot redeclare add_plugin() (previously declared in wp-content/plugins/slideshowpro-shortcode/slideshowpro_sc.php:342)

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

PHP Fatal error: Cannot redeclare add_plugin() (previously declared in wp-content/plugins/bootstrap-mce-elements/index.php:99)

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

PHP Fatal error: Cannot redeclare add_plugin() (previously declared in wp-content/plugins/tweet-button-anywhere/tweetbtn.php:59)

This file is part of the WordPress plugin eEngine.pl - Tweet button and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare add_plugin() (previously declared in wp-content/plugins/wp-scriptcase/wpscriptcase.php:78)

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

PHP Fatal error: Cannot redeclare add_plugin() (previously declared in wp-content/plugins/kkprogressbar/kkpb_prezentacja.php:412)

This file is part of the WordPress plugin KKProgressbar2 Free and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare add_plugin() (previously declared in wp-content/plugins/my-press-articles/includes/my-press-articles-register-tinymce-short-code-buttons.php:22)

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

PHP Fatal error: Cannot redeclare add_plugin() (previously declared in wp-content/plugins/wp-responsive-data-image/wp-responsive-data-image.php:70)

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

PHP Fatal error: Cannot redeclare add_plugin() (previously declared in wp-content/plugins/animated-buttons-with-css3/animated-buttons-with-css3.php:49)

This file is part of the WordPress plugin Animated Buttons with CSS3 and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare add_plugin() (previously declared in wp-content/plugins/qr-barcode/qr-barcode.php:35)

This file is part of the WordPress plugin QR Barcode 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.