Biztalk Build Error 'System.String' must be Xml serializable to be a message part type

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hi I encountered this error today while building an Orchestration

Error 9 'System.String' must be Xml serializable to be a message part type -- check event log for more information C:\asa\sds\oresCanonical.odx 

 

the Only solution I have is to restart visual studio every time i get this error

any Ideas to resolve this.