Problem: After moving a website to a new server, activating the WPML Multilingual CMS plugin resulted in a critical error, and the site appeared without translations.
Solution: First, we removed an outdated and incompatible version of the WPML String Translation plugin that was not supported by your Multilingual Blog license. Next, we addressed issues in the .htaccess file by renaming it and resaving permalinks to generate a fresh .htaccess file.
We then resolved PHP errors related to undefined functions and constants by updating WordPress to the latest version through https://www.optiparts.com/wp-admin/update-core.php. After updating, we successfully activated WPML and tested creating and translating posts in different languages.
We recommend activating other plugins one by one to identify any potential incompatibilities. Ensure to update all plugins and the theme to their latest versions.
If this solution does not resolve your issue, or if it seems outdated or irrelevant to your case, please check related known issues at https://wpml.org/known-issues/, verify the version of the permanent fix, and confirm that you have installed the latest versions of themes and plugins. We highly recommend opening a new support ticket for further assistance at WPML support forum.
