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The content type multipart/related; type="application/xop+xml";start="";boundary="uuid:5cb51ddb-a52c-460e-bf22-fefa278fe934+id=18";start-info="text/xml" of the response message does not match the content type of the binding (text/xml; charset=utf-8). If using a custom encoder, be sure that the IsContentTypeSupported method is implemented properly. The first 568 bytes of the response were: ' --uuid:5cb51ddb-a52c-460e-bf22-fefa278fe934+id=18 Content-ID: Content-Transfer-Encoding: 8bit Content-Type: application/xop+xml;charset=utf-8;type="text/xml" ERR_3002 --uuid:5cb51ddb-a52c-460e-bf22-fefa278fe934+id=18-- '.