I had started a topic already here… I thought I had solved it, but that appeared to be only locally… On production I still get the grey error.
Since that topic is solved, I created this one, to hopefully try to find the solution.
Can it be there is no output allowed when validating something ???
I’ve done some more testing… It looks like the error is showing properly when a $_GET value is NOT used…
Does anyone know if $_GET is messing the error up ?