Multipart Message: Exception solution

Hi, I am trying to receive a 3 part document using multipart message. I am facing an exception and do not know what is the cause: Exception: There was a failure executing the receive pipeline: “MultiPartMsg.RcvMP_Msg, MultiPartMsg, Version=1.0.0.0, Culture=neutral, PublicKeyToken=d1308c56b898dcb1” Source: “MIME/SMIME decoder” Receive Port: “RcvPortMPMsg” URI: “C:\Study\BZ\Messages\FileIN\MPMsg\*.txt” Reason: The MIME decoder cannot find a MIME part for the specified index. The Index was greater than the MIME part count.

Message Is :

MIME-Version: 1.0
Content-Type: multipart/related; type=”text/xml”;
boundary=”_968002A2-AAE4-43E0-90D3-83461FE91020_”
–_968002A2-AAE4-43E0-90D3-83461FE91020_
MIME-Version: 1.0
Content-Transfer-Encoding: binary
Content-Description: Header1
Header1Data_0
–_968002A2-AAE4-43E0-90D3-83461FE91020_
MIME-Version: 1.0
Content-Transfer-Encoding: binary
Content-Description: Header2
Header2Data_0
–_968002A2-AAE4-43E0-90D3-83461FE91020_–
MIME-Version: 1.0
Content-Transfer-Encoding: binary
Content-Description: POMsg
BodyData_0
–_968002A2-AAE4-43E0-90D3-83461FE91020_–

I am using Custome pipeline with MIME decoder and XML disassembler
Pipeline Setting are:
MIME Decoder:
Body Part Index=2
Allow Non MIME Message= True
XML Disaasembler:
Allow Unrecognized Message=True

Thanks in advance for any help or hints.