DataSource Controls :: Use Castle ActiveRecord With C#?

I'm trying to use Castle ActiveRecord with c#.

I'm moving data from an old database (FF2) to spatiaLite (sqLite)

The first few tables are updated without any problems. Then every table after gives and error

when I try to save. None of these tables have composite primary IDs.

SnapFarms tbl = new SnapFarms();
.... loop
if (theField.Equals("clientid")) tbl.operationId = getString(val, "{000-000}"); else
if (theField.Equals("farmid")) tbl.farmId = getString(val,"{000-000}"); else
if (theField.Equals("farmname")) tbl.farmName = getString(val,"Missing"); else ...
... end loop
tbl.Save();

exception message::Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index

There is no Index column so what is going on?