Well, as I said in my post above, the permissions code starts on line 190 in albums.php. I would just copy that code and put in the new error. You need to look up how standard_error gets called and what is required in your call to that function since that is the function you need to use to call your own custom error. The function standard_error is in includes/functions.php line 2801. The phrase you call instead of 'invalidid' must be phrase type Front-End Error Messages also.