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Problem:
The client is experiencing a PHP fatal error due to WPML_Gutenberg_Config_Option being defined twice in a WordPress environment using version 6.7.2 and sitepress-multilingual-cms.4.7.0. The error might stem from an incorrect update or usage by the previous developer.
Solution:
1. We recommend manually removing the

sitepress-multilingual-cms

folder from the plugins directory and then re-uploading it after downloading the latest version from your WPML.org account. This action should resolve the issue of the class being defined twice.
2. Increase the WordPress memory limit to at least 128MB, as recommended by WPML. You can do this by adding the following line to your

wp-config.php

file:

/* Memory Limit */<br />define('WP_MEMORY_LIMIT', '256M');

Ensure to place this code above the line /* That's all, stop editing! Happy blogging. */.
You can verify the updated memory limit in the WPML -> Support section of your WordPress dashboard.

If this solution does not apply to your case, or if it seems outdated, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. Should issues persist, please open a new support ticket at WPML support forum for further assistance.