Title: Plugin Conflict and Error Message
Last modified: April 9, 2021

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# Plugin Conflict and Error Message

 *  Resolved [prcapitalgroup](https://wordpress.org/support/users/prcapitalgroup/)
 * (@prcapitalgroup)
 * [5 years, 4 months ago](https://wordpress.org/support/topic/plugin-conflict-and-error-message/)
 * The plugin has been causing a minify conflict with Event Calendar Ticketing to
   not work properly. In addition, the following error is being shown. I am just
   wondering how the issues can be resolved. Thank you. 🙂
 *     ```
       Fatal error: Uncaught Error: Class 'WPO_Page_Cache' not found in /home/dh_xkrc6q/prcapitalgroup.org/wp-content/plugins/wp-optimize/includes/class-wp-optimize-options.php:286
       Stack trace:
       #0 /home/dh_xkrc6q/prcapitalgroup.org/wp-content/plugins/wp-optimize/wp-optimize.php(2381): WP_Optimize_Options->wipe_settings()
       #1 /home/dh_xkrc6q/prcapitalgroup.org/wp-includes/class-wp-hook.php(292): wpo_uninstall_actions('')
       #2 /home/dh_xkrc6q/prcapitalgroup.org/wp-includes/class-wp-hook.php(316): WP_Hook->apply_filters('', Array)
       #3 /home/dh_xkrc6q/prcapitalgroup.org/wp-includes/plugin.php(484): WP_Hook->do_action(Array)
       #4 /home/dh_xkrc6q/prcapitalgroup.org/wp-admin/includes/plugin.php(1286): do_action('uninstall_wp-op...')
       #5 /usr/local/wp/vendor/wp-cli/extension-command/src/Plugin_Command.php(915): uninstall_plugin('wp-optimize/wp-...')
       #6 [internal function]: Plugin_Command->uninstall(Array, Array)
       #7 /usr/local/wp/php/WP_CLI/Dispatcher/CommandFactory.php(99): call_user_func(Array, Array, Array)
       #8 [internal function]: WP_CLI\Dis in /home/dh_xkrc6q/prcapitalgroup.org/wp-content/plugins/wp-optimize/includes/class-wp-optimize-options.php on line 286
       Error: There has been a critical error on this website.Learn more about troubleshooting WordPress. There has been a critical error on this website.
       ```
   
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fplugin-conflict-and-error-message%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

Viewing 1 replies (of 1 total)

 *  [Harshad](https://wordpress.org/support/users/bornforphp/)
 * (@bornforphp)
 * [5 years, 4 months ago](https://wordpress.org/support/topic/plugin-conflict-and-error-message/#post-14301959)
 * Somehow there seems to be a file missing in the plugin.
    To fix the issue: – 
   use a FTP client to access your website’s files. – Browse to `wp-content/plugins`–
   Locate the folder wp-optimize and delete it. – At your website root, open the
   file wp-config.php – Locate the line that says `define('WP_CACHE', true);` – 
   Remove that line and save the file
 * This should restore access to your website.
    You can then re-install WP-Optimize
   from the plugin repository.

Viewing 1 replies (of 1 total)

The topic ‘Plugin Conflict and Error Message’ is closed to new replies.

 * ![](https://ps.w.org/wp-optimize/assets/icon-256x256.png?rev=1552899)
 * [WP-Optimize – Cache, Compress images, Minify & Clean database to boost page speed & performance](https://wordpress.org/plugins/wp-optimize/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/wp-optimize/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/wp-optimize/)
 * [Active Topics](https://wordpress.org/support/plugin/wp-optimize/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/wp-optimize/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/wp-optimize/reviews/)

 * 1 reply
 * 2 participants
 * Last reply from: [Harshad](https://wordpress.org/support/users/bornforphp/)
 * Last activity: [5 years, 4 months ago](https://wordpress.org/support/topic/plugin-conflict-and-error-message/#post-14301959)
 * Status: resolved