I sent an xml that begins with begins with

Sent where from where? I'm afraid you don't provide enough information to help you as the error is akin to 500 server error, it just means the response is not xml (doesn't begin with <)

In reply to Re: SOAP::Serializer::envelope: Client Application failed during request deserialization by Anonymous Monk
in thread SOAP::Serializer::envelope: Client Application failed during request deserialization by david2008

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