Hello,
I just installed the quickstart for the Kidzy template on a new Joomla 4.2.3 and PHP 8.1.24
It gives me the following error when I want to manage the Super Admin:
0 Call to undefined method Joomla\CMS\Application\AdministratorApplication::isAdmin() \
When I change the template to Cassiopeia, I still have the same issue.
Can you help me with this?
Regards, Peter



