Invalid key ':defMacro' when performing validate

Code:

  invoice = QB::Invoice.new(

:ShipDate => Date.today,

:IsToBePrinted => true,

:IsToBeEmailed => false,

:DueDate => Date.today + 1.month,

:CustomerRef => { :ListID => user[:listid] },

#:TemplateRef => { :ListID => " "},

:InvoiceLine => gf_invoice_line

  )



  if invoice.valid?

invoice.save

  end

Not sure exactly what's causing it, but must be the validate routine is looking for a defMacro attribute when there is none available for this object.