othmaneB-4

Problem:
The client is seeing a below error:
Fatal error: Uncaught Error: Call to undefined function mb_ereg_replace_callback() on updating the secondary language page.

Solution:
This issue usually happens when the "Multibyte String" PHP extension is not enabled by your server, which is necessary for the WPML plugin to work properly: https://wpml.org/home/minimum-requirements/

So please contact your hosting support and ask them to enable it on your site. Here is some information about it: https://www.php.net/manual/en/book.mbstring.php