I have installed the GK Reporter Quickstart Pack for Joomla 4.
From an old website, I imported articles, users, etc., into the database.
What doesn't work:
When creating a new menu, the error appears: Deprecated: preg_match(): Passing null to parameter #2 ($subject) of type string is deprecated in /home/veterin/sterg.veterinarul.ro/plugins/system/jacontenttype/jacontenttype.php on line 421.
When installing a new language, the website does not open, and the error appears: 0 Failed to parse time string (04.Septembrie) at position 7 (e): The timezone could not be found in the database.
All folders have correct permissions.
The configuration.php file is correct.
I believed that creating a new website and importing data from the old site would lead to better performance, but it seems that there are more issues than anticipated.
What should be done?