Title: WPML\WPML_PLUGIN_FOLDER – fatal error
Last modified: April 5, 2025

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# WPML\WPML_PLUGIN_FOLDER – fatal error

 *  [dev](https://wordpress.org/support/users/devksec/)
 * (@devksec)
 * [1 year, 1 month ago](https://wordpress.org/support/topic/wpmlwpml_plugin_folder-fatal-error/)
 * Hello,
   We’re encountering a fatal error when accessing the WooCommerce product
   admin page. The issue appears to be caused by an undefined constant `WPML\WPML_PLUGIN_FOLDER`
   in the WooCommerce Multilingual plugin (`UIPage.php:45`). It looks like the plugin
   is attempting to use a constant from WPML that may not be defined or properly
   loaded. WPML core may be missing, inactive, or there’s a version mismatch between
   WPML and WCML.
 * Steps to reproduce:
    1. Go to WooCommerce > Products in the WordPress admin
    2. Fatal error is thrown, preventing access to the product list
 * Error Level: E_ERROR
   Message: Uncaught Error: Undefined constant “WPML\WPML_PLUGIN_FOLDER”
   in /home/WEBSITEPATH/wp-content/plugins/woocommerce-multilingual/addons/wpml-
   dependencies/vendor/wpml/core-api/core/UIPage.php:45Stack trace: 0 /home/WEBSITEPATH/
   wp-content/plugins/woocommerce-multilingual/addons/wpml-dependencies/vendor/wpml/
   core-api/core/UIPage.php(149): WPML\UIPage::init() 1 /home/WEBSITEPATH/wp-content/
   plugins/elementor/vendor/composer/ClassLoader.php(576): include(‘/home/ksc5577p/…’)
   2 /home/WEBSITEPATH/wp-content/plugins/elementor/vendor/composer/ClassLoader.
   php(427): Composer\Autoload{closure}() 3 /home/WEBSITEPATH/wp-content/plugins/
   woocommerce-multilingual/classes/Utilities/AdminUrl.php(118): Composer\Autoload\
   ClassLoader->loadClass() 4 /home/WEBSITEPATH/wp-content/plugins/woocommerce-multilingual/
   classes/Utilities/AdminUrl.php(151): WCML\Utilities\AdminUrl::getWPMLTMDashboard()
   5 /home/WEBSITEPATH/wp-content/plugins/woocommerce-multilingual/inc/admin-menus/
   class-wcml-admin-menus.php(177): WCML\Utilities\AdminUrl::getWPMLTMDashboardProducts()
   6 /home/WEBSITEPATH/wp-includes/class-wp-hook.php(324): WCML_Admin_Menus::documentation_links()
   7 /home/WEBSITEPATH/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters()
   8 /home/WEBSITEPATH/wp-includes/plugin.php(517): WP_Hook->do_action() 9 /home/
   WEBSITEPATH/wp-admin/admin-footer.php(78): do_action() 10 /home/WEBSITEPATH/wp-
   admin/edit.php(518): require_once(‘/home/ksc5577p/…’) 11 {main}
 * thrown
   File: /home/WEBSITEPATH/wp-content/plugins/woocommerce-multilingual/addons/
   wpml-dependencies/vendor/wpml/core-api/core/UIPage.phpLine: 45Request: /wp-admin/
   edit.php?post_type=productReferrer: https%3A%2F%2FWEBSITE%2Fwp-admin%
 * We’d appreciate guidance on resolving this compatibility issue.

Viewing 3 replies - 1 through 3 (of 3 total)

 *  Thread Starter [dev](https://wordpress.org/support/users/devksec/)
 * (@devksec)
 * [1 year, 1 month ago](https://wordpress.org/support/topic/wpmlwpml_plugin_folder-fatal-error/#post-18401269)
 * Rolling back to 5.3.9 fixes the issue. It also fixes the product quick edit which
   was broken. Seems the latest version is causing a few issues.
 *  Plugin Author [Pierre Sylvestre](https://wordpress.org/support/users/strategio/)
 * (@strategio)
 * [1 year, 1 month ago](https://wordpress.org/support/topic/wpmlwpml_plugin_folder-fatal-error/#post-18403095)
 * Hi [@devksec](https://wordpress.org/support/users/devksec/),
 * Thanks for your report!
 * Indeed, it seems like a bug in our latest version (5.4).
 * It throws a fatal error in the admin footer of the product list screen on servers
   with PHP8+. And the symptom is that some features are broken, like “quick edit”
   of products.
 * As a quick workaround, I would suggest to add the following line in your `wp-
   config.php` file:
 *     ```wp-block-code
       define( 'WPML_PLUGIN_FOLDER', 'sitepress-multilingual-cms' );
       ```
   
 * We’ll try to fix it as soon as possible.
 * Note: Once it will be fixed in next WCML patch version, you should remove the
   workaround.
 * Thanks,
 * Pierre
 *  Plugin Author [Pierre Sylvestre](https://wordpress.org/support/users/strategio/)
 * (@strategio)
 * [1 year, 1 month ago](https://wordpress.org/support/topic/wpmlwpml_plugin_folder-fatal-error/#post-18408048)
 * Hi [@devksec](https://wordpress.org/support/users/devksec/),
 * With released WCML 5.4.4 which should fix the problem.
 * Let us know otherwise or close the ticket.
 * Thanks,
 * Pierre

Viewing 3 replies - 1 through 3 (of 3 total)

The topic ‘WPML\WPML_PLUGIN_FOLDER – fatal error’ is closed to new replies.

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## Tags

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

 * 3 replies
 * 2 participants
 * Last reply from: [Pierre Sylvestre](https://wordpress.org/support/users/strategio/)
 * Last activity: [1 year, 1 month ago](https://wordpress.org/support/topic/wpmlwpml_plugin_folder-fatal-error/#post-18408048)
 * Status: not resolved