When run mySender channel in XI ,Message monitoring always show this error?

Dear XI Consultant:

Pls give me a help.

the mapping is alread ok.

and always show IDOC adpter error?

how to solve this problem.

My RFC in XI: D02CLNT131

Port in XI:SAPD02

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

- <!-- Call Adapter

-->

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

<SAP:Category>XIAdapter</SAP:Category>

<SAP:Code area="IDOC_ADAPTER">ATTRIBUTE_INV_SND_SERV</SAP:Code>

<SAP:P1 />

<SAP:P2 />

<SAP:P3 />

<SAP:P4 />

<SAP:AdditionalText />

<SAP:ApplicationFaultMessage namespace="" />

<SAP:Stack>Unable to convert sender service to an ALE logical system</SAP:Stack>

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

</SAP:Error>