Appreciate it Toivo!, encountered the same issue, but that solution worked for me.Welcome to the Joomla forum!
The missing class is declared in the file plugins/behaviour/compat/src/Extension/Compat.php. Does that file exist?
Locate the file administrator/cache/autoload_psr4.php and delete it. Access Joomla 4 again and the file will get recreated automatically. This file is a map to all PHP classes Joomla uses and it is created and maintained automatically.
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Statistics: Posted by mtomy2008 — Wed Jan 31, 2024 8:42 am