Assigning Untyped Message to Typed Message

Hi Gurus,

                I have a receive port which is bind to generic Xml Document. Which I can receive two different Xml messages , Both the type of messages I receive is not having NameSpace, One message is having only one node in it so I am adding Root node to that. So Once I receive Any One Message on Generic receive port  I am Calling .net Component to add root nod and namespace which returns new Xml Doc.

But Once I receve modified message from Custom .net component, Before that I have two Schemas for two different messages which are like Newly modified messages.

But when I am trying to assign Newly  formed message from .net component to typed message which I have created schema for that Its throwing me an error saying General System Exception: The type initializer for
‘AB.BIZ.Orchestrations.__AB_Common_Schemas_ErrorRes__’ threw an
exception.

I m doing lIke

msgErrorXml = varHelperCore.GetErrorResponse(msgGenericRMResponse);

varXmlDoc.LoadXml(@”<ns0:Errors xmlns:ns0=””http://AB.Common.Schemas.ErrorRes””&gt;

  <ERROR></ERROR> 

  </ns0:Errors>”);

varXmlDoc = msgErrorXml;

msgErrorRes.Response = msgErrorXml;

Please Help!!!!