I have had some issues with my forums so I asked the hosting company to remove it completely and install a new version. Now, when I make any change in the Admin Control Panel, though the change message says it is successful, it shows this error message:
Invalid Page URL. If this is an error and the page should exist, please contact the system administrator and tell them how you got this message.
I also noticed that after changing the membership of a registered user into administrators, it is not working. When the user logs in, he is still a registered user rather than an admin and cannot have access to control panel or other administrative privileges.
Attached animated gif file shows the problem
https://giphy.com/gifs/xT9IgjqUw1YnZDH2bm
Invalid Page URL. If this is an error and the page should exist, please contact the system administrator and tell them how you got this message.
I also noticed that after changing the membership of a registered user into administrators, it is not working. When the user logs in, he is still a registered user rather than an admin and cannot have access to control panel or other administrative privileges.
Attached animated gif file shows the problem
https://giphy.com/gifs/xT9IgjqUw1YnZDH2bm
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