I have been updating to Joomla 4 and I continue to get an error
Call to undefined method Joomla\CMS\Application\AdministratorApplication::isAdmin()
I have unistalled any of the plugins that have given me issues though I keep getting a notice that the SP Pagebuilder may have issues with the upgrade. I install the newest version and it still gives me an error when I try to do the upgrade. I have update and upgraded all of the components.
Hi Nicole.
Set that inside configuration.php file and you will see what element made a mess!
This is Joomla Basics Knowledge, webmasters should always enable Debug & Error Max (in Global Configuration) BEFORE updating to Joomla 4 or J5. Forgive me, but this is repeated like a Matra in every Joomla upgrade guide. In your case only file edition left. But don't worry, everything can be fixed.
I had our coder look at it and it was due to some Joomla 3 files that were being caught and not updating.
Debug mode always helps. CMS upgrade is not always a easy proccess, unfortunately.
