I'm officially stumped on this issue with creating new tickets. I have a custom form that I'm using, and I have hidden a few of the default fields that I don't need by just commenting them out in the ticket-open-inc.php file. My ticket form looks like this:

At first I was getting a database error upon ticket creation so I thought that was the issue, but I was able to fix that by deleting a problematic queue. But I can't figure out why I keep getting this "Missing or invalid data - correct any errors below and try again" error. I have tried un-commenting the default fields to see if that would fix it, but the error still shows up. Anyone have any ideas?