The error message about the class JError shows that one of the third party extensions is not compatible with Joomla 4. Go to the Global Configuration and set the option 'Error Reporting' to 'Maximum' and turn on the option 'Debug System'. These options will display a detailed error message that has the name of the script and the line number, followed by the PHP call stack. Post those details here.
Statistics: Posted by toivo — Wed Jun 26, 2024 9:35 pm