I'm getting this error when I try to save new category. However, the category is created after I refresh listing. Any ideas?

Call to undefined method Joomla\CMS\Application\AdministratorApplication::getParams() 

Joomla version 3.8.1 PhP 7.0 All extensions are up-to-date and I disabled any that are not specifically joomla 3.8 compliant Also running civicrm 4.7.25


This problem is very common now - and it is usually caused by a manual update of the Joomla website, which typically results in a libraries folder that is not compatible with the current Joomla website. A quick resolution to this problem is to rename your libraries folder and then recopy a libraries folder from a Joomla 3.8.1 install. See here.

If that doesn't help, then try recoyping the administrator/components/com_content folder to your Joomla website (from Joomla 3.8.1) after renaming the old com_content folder.


Take these simple steps ...

Global Check-in... /administrator/index.php?option=com_checkin

Clean cache... /administrator/index.php?option=com_cache

Clean expired cache... /administrator/index.php?option=com_cache&view=purge

and then...

Fix database... /administrator/index.php?option=com_installer&view=database

Finally, try again.

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