SELECT ... FROM .... INTO CURSOR MyCursorBoundToCombo, you might get this specific error as for one moment the cursor is closed and recreated again. To workarround the issue
THISFORM.MyComboBox.Rowsource = "" SELECT ... FROM .... INTO CURSOR MyCursorBoundToCombo THISFORM.MyComboBox.RowSource = "MyCursorBoundToCombo.Field1, Field2"HTH