If you are unable to edit page restrictions on a wiki page, then there may be a group or NetID in the restrictions list who was subsequently removed from our system. If that group or NetID is still listed in the permissions for that page, then removing that group or NetID will fix the issue. You can do this via Browse > Space Admin > Page Restrictions. Click the unlock icon for the old group or NetID to remove it.
Need more help? Submit an ITS Service Desk Request.