Error exception return from pipeline processing!

when an iddoc from sap ecc it is sent to the server IP to revise SXMB_MONI transaction is received iddoc, trying to process it sends me a message saying, Error return from exception processing pipeline! and I get this error

<? xml version = "1.0" encoding = "UTF-8" standalone = "yes"?>

- <! - Request Message Mapping

->

- http://sap.com/xi/XI/Message/30" xmlns: SOAP = " http://schemas.xmlsoap.org/soap/envelope / ">

<SAP:Category> Application </ SAP: Category>

Area="MAPPING"> <SAP:Code STREAM_TRANSFORMATION_EX </ SAP: Code>

<SAP:P1> mx/com/sap/cfd/mapping/JMapping71 </ SAP: P1>

Trying <SAP:P2> class java.lang.NullPointerException while ~ </ SAP: P2>

<SAP:P3 />

<SAP:P4 />

<SAP:AdditionalText />

StreamTransformationException <SAP:Stack> mapping application program triggered by mx/com/sap/cfd/mapping/JMapping71; class java.lang.NullPointerException while Trying ~ </ SAP: Stack>

<SAP:Retry> M </ SAP: Retry>

</ SAP: Error>