When importing values from or exporting values to a workbook you need to consider the number of model objects involved.  When multiple objects are being either sent to or received from a single range in a workbook, the number of columns in the range must coincide with the number of model objects.  Keep in mind that a derived set counts as more than one object depending upon its dimension.  You must either adjust the size of the workbook range to the correct number of columns or edit the set of model objects involved in the interface statement.