Error in Conversation Script

I get this error, it looks like the seller receiving the RNIF document can not process it and throws an exception, but I do not know why.
Anyone see this before?

“General Exception” received from trading partner DUNS: 123456789
Global Message Exception Code: UNP.MESG.GENERR
Pip Number: P31
Reason: Received out of band document with the instance id – 0a000051f70d9c2500000227

“Reason: Received out of band document with the instance id – 0a000051f70d9c2500000227”

Reason for this exception might be TN received the Duplicate document with same conversationID and conversation step triggered “wm.ip.cm.handlers:processUnhandledDocument” and which thrown this general exception.Pls check whether you might have received the same document earlier or might be some thing missing in the received PIP document itself.

HTH.

Hi,

I also encouter the same error. Unable to send receipt ACK after receiving 3A4C exeption as follows.

<ExceptionDescription>

  <errorClassification>

    <GlobalMessageExceptionCode>UNP.MESG.GENERR</GlobalMessageExceptionCode>

  </errorClassification>

  <errorDescription>

    <FreeFormText>Error during unpackaging -3101_chk0001 -- Incorrect data content</FreeFormText>

  </errorDescription>

</ExceptionDescription>

<GlobalExceptionTypeCode>Receipt Acknowledgment Exception</GlobalExceptionTypeCode>

Please help. Thanks.