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Problem:
The client is experiencing issues saving and translating pages using WPML and Visual Composer, encountering a PHP Fatal error. This error is related to a protected method invocation in Visual Composer when integrated with WPML.
Solution:
We recommend following the steps outlined in the WPML errata for resolving issues with Visual Composer and PHP Fatal errors. First, ensure to back up your database before making any changes. You can find the detailed instructions here: Visual Composer Fatal Error when translating a page in PHP 8.0.x.

If this solution does not apply to your case, or if it seems outdated, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have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