softartisans excelwriter is telling me "binding mentioned in %%value couldn't be found in current group", but it is.

Question

My template looks like this:

%%group  
%%header  
%%value(section1.sectionName)  
%%=section1.col1(Optional)  %%=section1.col2(Optional)  %%=section1.col3(Optional)
%%footer  
%%endgroup  

I create my table like so:

Dim dtMain As New DataTable

dtMain.Columns.Add("sectionName")

For i As Integer = 1 To 3

    dtMain.Columns.Add("col" & i.ToString)

Next

...populate table

xlt.BindData(dtMain, "section1", xlt.CreateDataBindingProperties)

And then I get the following error:

"binding mentioned in %%value couldn't be found in current group"

But sectionName is there. I've tried it with the positional in the value data marker too:

%%value(section1.#1) 

and I get the same message.

Please can someone throw me a bone here? I can't find anything with good, real world code samples out there.

Thanks.