Unknown column 'isSystem' in 'field list'
Error message
Unknown column 'isSystem' in 'field list'
Cause
Your database user doesn't have ALTER or DROP permission.
Solution
Step 1
Ask your server host to fix the permissions of your database user! Make it have ALTER and DROP permission too.
Step 2
If you are using WordPress, press the Analyze & Repair button.
If you are using Joomla, go to the Help center and press Analyze & repair possible database issues.
This will rerun our database update codes, so if your user has correct permissions now, you shouldn't see "isSystem" errors anymore.