Problem: You are trying to activate the WPML Multilingual CMS plugin, but you encounter an issue when the wp-404-caching plugin is also activated. You are using WordPress version 6.6, WPML Multilingual CMS version 4.6.13, and wp-404-caching version 1.10. The WPML Multilingual CMS plugin cannot be activated if the wp-404-caching plugin is activated. Solution: We have found that the wp-404-caching plugin is not listed in our compatible plugins directory nor in the WordPress repository. This indicates that it has not been tested for compatibility with WPML by our team. If you're experiencing this issue, we recommend deactivating the wp-404-caching plugin to enable the activation of the WPML Multilingual CMS plugin.
Please note that this solution might be irrelevant if it's outdated or not applicable to your case. 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. If the problem persists, please open a new support ticket at our support forum.
