Go to Extensions -> Templates , make sure Styles is selected on the left
Check one of the templates that has no other styles (in the default install each template is suitable) to delete it -> Click the button Delete in the top menu
Check the language in the error: Before this patch it points to Extensions-> Extension manager-> Manage->
After this patch the path is changed according to the language changes (Extensions -> Manage -> Manage)This comment was created with the J!Tracker Application at issues.joomla.org/joomla-cms/7876.
Just read the discussion on issue #7850
If that issue results in a language change, this PR needs to be changed too.
This comment was created with the J!Tracker Application at issues.joomla.org/joomla-cms/7876.