Title: Help with critical error when activating plugin
Last modified: March 1, 2021

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# Help with critical error when activating plugin

 *  Resolved [zbloomz](https://wordpress.org/support/users/zbloomz/)
 * (@zbloomz)
 * [5 years, 2 months ago](https://wordpress.org/support/topic/help-with-critical-error-when-activating-plugin/)
 * I need help when trying to activate the plugin I get the following message and
   email!
 * There has been a critical error on this website. Please check your site admin
   email inbox for instructions.
 * Can you help?
 * When seeking help with this issue, you may be asked for some of the following
   information:
    WordPress version 5.6.2 Current theme: Neve (version 2.10.2) Current
   plugin: WooCommerce (version 5.0.0) PHP version 7.3.27
 * Error Details
    ============= An error of type E_ERROR was caused in line 15 of
   the file /home2/findypy8/public_html/pearlhousefarm/wp-content/plugins/woocommerce/
   packages/woocommerce-admin/src/Notes/Note.php. Error message: Uncaught Error:
   Class ‘WC_Data’ not found in /home2/findypy8/public_html/pearlhousefarm/wp-content/
   plugins/woocommerce/packages/woocommerce-admin/src/Notes/Note.php:15 Stack trace:#
   0 /home2/findypy8/public_html/pearlhousefarm/wp-content/plugins/woocommerce/vendor/
   jetpack-autoloader/class-php-autoloader.php(87): require() #1 [internal function]:
   Automattic\Jetpack\Autoloader\jp1c37d41437aca3a88a6b698473c4d5c4\PHP_Autoloader::
   load_class(‘Automattic\\WooC…’) #2 [internal function]: spl_autoload_call(‘Automattic\\
   WooC…’) #3 /home2/findypy8/public_html/pearlhousefarm/wp-content/plugins/optinmonster/
   OMAPI/WooCommerce.php(542): class_exists(‘Automattic\\WooC…’) #4 /home2/findypy8/
   public_html/pearlhousefarm/wp-includes/class-wp-hook.php(287): OMAPI_WooCommerce-
   >maybe_store_note(”) #5 /home2/findypy8/public_html/pearlhousefarm/wp-includes/
   class-wp-hook.php(311): WP_Hook->apply_filters(NULL, Array) #6 /home2/findypy8/
   public_html/pearlhousefarm/wp-includes/plugin.php(484): WP_Hook->do_action(Array)#
   7 /home2/fin

Viewing 2 replies - 1 through 2 (of 2 total)

 *  Plugin Support [Gabriel – a11n](https://wordpress.org/support/users/gabrielfuentes/)
 * (@gabrielfuentes)
 * [5 years, 2 months ago](https://wordpress.org/support/topic/help-with-critical-error-when-activating-plugin/#post-14120105)
 * Hi there 👋
 * This kind of problem is usually caused by a conflict with your theme or with 
   another plugin.
      The best way to determine this is to:
    - Temporarily switch your theme to [Storefront](https://www.woocommerce.com/storefront/)
    - Disable all plugins except for WooCommerce
    - Repeat the action that is causing the problem
 * If you’re not seeing the same problem after completing the conflict test, then
   you know the problem was with the plugins and/or theme you deactivated. To figure
   out which plugin is causing the problem, reactivate your other plugins one by
   one, testing after each, until you find the one causing conflict. [You can find a more detailed explanation on how to do a conflict test here.](https://docs.woocommerce.com/document/how-to-test-for-conflicts/)
 * **Before you start**
    1. First, please make sure you have a good backup in place of your full site and
       database. Most hosting companies have this included in the subscription, but
       you could also consider using a service like Jetpack. If something goes wrong,
       it’s nice to know that you can restore your site.
    2. Second, I would suggest installing a plugin called Health Check & Troubleshooting.
       This is a plugin developed by the WordPress community and it allows you to disable
       plugins without affecting your current site visitors.
 * I hope that helps!
 *  Plugin Support [abwaita a11n](https://wordpress.org/support/users/abwaita/)
 * (@abwaita)
 * [5 years, 2 months ago](https://wordpress.org/support/topic/help-with-critical-error-when-activating-plugin/#post-14153684)
 * Hi [@zbloomz](https://wordpress.org/support/users/zbloomz/),
 * We’ve not heard back from you in a while, so I’m marking this thread as resolved.
   Hopefully, you were able to find a solution to your problem!
 * If you have further questions, please feel free to open a new topic.
 * Thanks.

Viewing 2 replies - 1 through 2 (of 2 total)

The topic ‘Help with critical error when activating plugin’ is closed to new replies.

 * ![](https://ps.w.org/woocommerce/assets/icon.svg?rev=3234504)
 * [WooCommerce](https://wordpress.org/plugins/woocommerce/)
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 * [Support Threads](https://wordpress.org/support/plugin/woocommerce/)
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 * [Unresolved Topics](https://wordpress.org/support/plugin/woocommerce/unresolved/)
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## Tags

 * [Activating](https://wordpress.org/support/topic-tag/activating/)
 * [critical error](https://wordpress.org/support/topic-tag/critical-error/)

 * 2 replies
 * 3 participants
 * Last reply from: [abwaita a11n](https://wordpress.org/support/users/abwaita/)
 * Last activity: [5 years, 2 months ago](https://wordpress.org/support/topic/help-with-critical-error-when-activating-plugin/#post-14153684)
 * Status: resolved