Can’t save any Corner AD


I can’t save any AD, since I always get a 403 forbidden error:


You don’t have permission to access this resource.

Additionally, a 403 Forbidden error was encountered while trying to use an ErrorDocument to handle the request.”

I believe that’s because WordPress (v6.3.1) is trying to access this URL: <site>/wp-admin/options-general.php?page=corner-ad.php

Can you please give me a hint?



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