Problem:
We have a problem with the translation of the products on the site. Each time we want to add a translation a PHP fatal error appears:
Uncaught error: call to a member function get_source_language_code() on bool in /plugins/sitepress-multilingual-cms/vendor/wpml/tm/inc/functions-load.php:496
Solution:
Please follow the steps below:
- Create a full site backup or create a staging site with a copy of the production site.
- Update all extensions.
- Clear any cache that may exist (on site and on server).
- Deactivate all extensions except WPML.
- Activate a default WordPress theme, such as Twenty Twenty.
- If the problem has disappeared, activate the theme first, then the extensions, one by one, until the problem reappears and you should find the culprit.
