Check the following KB articles that have the same error messsage, perhaps
one of the solutions described within them may help you out.
318917 PRB: Error Messages When You Use ODBC .NET Data Provider in WebForm
816223 BUG: You Receive an XmlException Error When You Build a Serialization
827476 Incorrect reference or missing reference to Office 2003 primary
Thanks! Robert Gruen
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