I've also seen the same error, and it might be the same thing, when I'm binding to a DataView that doesn't exist (this is Mere Mortals specific). So when I do mmDataSet.GetDataView("MyDatView") and I misssppelled "MyDataView", same thing.

Don't know if that applies. Hope you figure it out. My stack trace was pretty cryptic, but seemed to point to data binding.

Mike