Native Exception error with Relate4Skip

Hello group,

CodeBase 6.5
VB.NET 2003
PocketPC application

I am relatively new to CodeBase and am trying to get a sorted set of
records from a table and add them to a listview (which I have done
successfully with just a table and seeking).  I have reviewed the
documentation and performed a few searches on the this newsgroup and
have put together the following code (this is just the code that should
loop through the relation and populate the listview)

            MasterRelation = relate4init(dbFacilities)
            rc = relate4querySet(MasterRelation, "IMID = '" & strIMID &
"'")
            rc = relate4sortSet(MasterRelation, "BIF->FACILITY")

            ptrFacility = d4field(dbFacilities, "Facility")
            ptrFID = d4field(dbFacilities, "Fid")

            rc = relate4top(MasterRelation)
            Do Until rc <> r4success
                Dim item As New ListViewItem(f4str(ptrFacility))

                item.SubItems.Add(Trim(f4str(ptrFID)))
                lvFacilities.Items.Add(item)
                rc = relate4skip(MasterRelation, 1)
            Loop

When I run the function with this code, I get a Native Exception error
when rc = relate4skip(MasterRelation, 1) is run.  I debugged the code
and do not get errors with the relat4QuerySet or relat4sortSet calls.
I am only using one table in my relation since I only want to sort.
Any ideas why the Relate4skip call throws an error?

Sean M. Severson