Joscha

Problem:
The client is experiencing a TypeError in the WPML Multilingual CMS Plugin, specifically an 'Uncaught TypeError: OTGSInstallerFPpartial(): Argument #1 ($function) must be of type callable, array given' in the file /var/www/clients/client80/web383/web/wp-content/plugins/sitepress-multilingual-cms/vendor/otgs/installer/includes/utilities/FP/functions.php. This error occurs when attempting to perform an action.
Solution:
We recommend checking the version of your WPML plugin. If it is not the latest, please remove all WPML plugins, including the OTGS Installer. Then, download and install Version 4.6.15 from https://wpml.org/download/wpml-multilingual-cms/?section=changelog. This should resolve the issue.

If this solution does not apply to your case, or if it seems outdated, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have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