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Problem:
The client is experiencing a fatal error when trying to activate the WPML SEO plugin, even though other WPML plugins are functioning correctly.

Solution:
First, we recommend ensuring that your server meets the WPML minimum requirements.

Next, perform a compatibility check by following these steps:
1. Create a full website backup.
2. Disable all plugins except for WPML and its add-ons.
3. Check if the issue persists.
4. If the issue is resolved, reactivate your plugins one by one to identify the conflicting plugin.
5. If the issue still occurs with only WPML plugins active, switch to a default WordPress theme like TwentySeventeen and test again.
It's best to perform these tests in a staging environment if possible.

Additionally, provide your WPML Debug information by following this guide: WPML Debug information.

To get a more detailed error message, add the following code to your

wp-config.php

file:

define( 'WP_DEBUG', true );<br />define( 'WP_DEBUG_LOG', false );<br />define( 'WP_DEBUG_DISPLAY', true );

If the issue persists, try removing the WPML SEO plugin, re-download it from the official download page, and reinstall it on your site.

If none of these steps resolve the issue, please open a new support ticket for further assistance. We also highly recommend checking related known issues on the WPML Known Issues page, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If the solution provided here is outdated or not applicable to your case, do not hesitate to contact us through the WPML support forum.