InfoPath Dev

I am trying to programmatically insert a new entry in a sharepoint list when a user clicks a cmd button.

I am modeling my solution after the how-to regarding deleting a form in a library.

My XML SEcondary Data Source Looks Like this and is named Add List Item Template:
<?xml version="1.0" encoding="UTF-8"?>
<AddListItems>
<ListName>{0A3CB4D1-CB8D-4AE4-A336-D106517F8D9A}</ListName>
<Batch OnError="Continue">
<Method ID="1" Cmd="New">
<Field Name="Item"></Field>
<Field Name="Champion"></Field>
<Field Name="Assigned"></Field>
<Field Name="Due"></Field>
<Field Name="Completed"></Field>
</Method>
</Batch>
</AddListItems>

My Code Looks like this:
Public Function createFollowUp(ByVal Action As String)

thisXDocument.GetDOM("Add List Item Template").selectSingleNode("/AddListItems/Batch/Method/Field[@Name = 'item']").text = Action

Dim webservice As WebServiceAdapter2
webservice = thisXDocument.DataAdapters.Item(4)
webservice.Submit()

End Function

I get the error:
System.NullReferenceException
Object reference not set to an instance of an object.
at SafetyAudits.SafetyAudits.createFollowUp(String Action)
at SafetyAudits.SafetyAudits.CTRL647_4_OnClick(DocActionEvent e)
at Microsoft.Office.Interop.InfoPath.SemiTrust._ButtonEventSink_SinkHelper.OnClick(DocActionEvent pEvent)

Most of what I have read regarding this error says that I am not referencing the xml properly but I am unable to figure it out...

Here are some links that are similar.

http://www.infopathdev.com/forums/topic.asp?TOPIC_ID=2886

http://www.infopathdev.com/howto/tutorials/default.aspx?i=7bc880f391b84ea9b3b45c6fbecc07c6

I am not sure it is possible to have the GUID in the CAML template. I thought it needed to be another field since the GUID is identifying the list and not part of the list data.
I could be wrong but I know the steps in the links work.

I don't think the issue is with how I set up the data sources it appears to be with how i am trying to set the value in the CAML template. What I am trying to do was modeled after this "How-To":

http://www.infopathdev.com/howto/tutorials/default.aspx?i=1d52979046884d8186c9393a1ea95109

I want to programmatically assign the value in the CAML like this and that is where the error occurs:

thisXDocument.GetDOM("Add List Item Template").selectSingleNode("/AddListItems/Batch/Method/Field[@Name = 'item']").text = Action

Do I have to do something with a namespace to be able to access this CAML I have created?

Thanks for your time so far. I appreciate your help.

For some reason the selectSingleNode() statement is not returning a reference to that node. You will have to alter the XPath to correctly select the node. It does sound like there might be a namespace issue here, but if this is just a 2DS that you imported into the form then there shouldn't be a namespace problem. Maybe the 'item' row hasn't been inserted at the time that this code is called?

You could add a IF block that tests to see if the node is null, and if so, quits.