InfoPath Dev

sorry the error I'm getting is "dsf namespace not defined"

I'm new to infopath 2007 but I'm devloping a a form that have a Main DS and a Secondary DS to a SharePoint List   The goal here is to have the user select a Firm (Firm_Name) and them populate the Account Id (Pfx_ID) problem I recieve an error from this code: Public Sub Firm_Name_Changed(ByVal sender As Object, ByVal e As ...