InfoPath Dev

Form fails to open throws a correlation error and this is in the event viewer. Anyone have any ideas? Form has been working without issue. I've tried reuploading the form, moving it to a new document library same error. The design checker has only warning a template part has an updated version and buttons send queries. The form template failed to load. (User: RECOVERYHC\, Form Name: Training Completed, IP: , Request: servername/_layouts/FormServer.aspx?XmlLocation=/salesreps/Training Complete/user Account Manager.xml&ClientInstalled=true&Source=https://www.rhcmail.com/salesreps/Training%2520Complete/Forms/AllItems.aspx&DefaultItemOpen=1, Form ID: urn:schemas-microsoft-com:office:infopath:Training-Completed:-myXSD-2012-03-09T15-00-03, Type: ArgumentException, Exception Message: Column 'Position' does not exist. It may have been deleted by another user. /Training)

Somehow and I don't know how one of my data connections to another library has a column Position. I needed to add Position to the data connection data sources. I don't remember that being there or how it was deleted but by adding it to the form it started working again. I am assuming there is something in this form looking for that particular "Position" in that data source will have to look around.