Strange problems going on with a client's Joomla Ja Tour website.
Checked PHP and we were running 8.1, so I switched things back to 8.0 and still getting this error.
Modules and Plugins report properly, but noticed a strange "COM_FFEXPLORER_MENU" Component I don't recognize so maybe SQL is trashing itself and causing other issues with our website.
Front-end works just fine, but sporadic Administrator interfaces are not working, and these type of errors "Call to Member Function " are pretty common over the last 5 or so years. Nothing I've found helps with our problem and I'd appreciate if someone can take a look.