Error occurs in HTTP to RFC

HI,
When doing the exercise in TBIT40, I meet with a problem in HTTP to RFC. It always returns me such error msg in the html client: <SAP:Error><SAP:Category>XIAdapterFramework</SAP:Category><SAP:Code>MESSAGE.GENERAL</SAP:Code><SAP:AdditionalText>com.sap.aii.af.ra.ms.api.DeliveryException: java.lang.NullPointerException</SAP:AdditionalText></SAP:Error>
I don't know what's the exact reason for that, however, I am sure the BAPI program is not called. Using SXMB_MONI, we can see the response message (from Service: HEDCLNT001 Namespace: urn:sap-com:document:sap:rfc:functions Interface: ZBAPI_PO_CREATE) with above error and no XML payload at all. There's no error in the request message. I suspect if the communication channel is not created correctly as the document doesn't give a clear description on creation steps.
My question:
1. Is there any method to test if the RFC could be called properly from XI side using the communication channel I created?
2. What is the possible reason for the error I just met with? Any available solution?
Thanks & Best Rgds,
Jerry

The error segment in the response message:
<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
- 
- <SAP:Error xmlns:SAP="http://sap.com/xi/XI/Message/30" xmlns:SOAP="http://schemas.xmlsoap.org/soap/envelope/" SOAP:mustUnderstand="1">
<SAP:Category>XIAdapterFramework</SAP:Category>
<SAP:Code area="MESSAGE">GENERAL</SAP:Code>
<SAP:P1 />
<SAP:P2 />
<SAP:P3 />
<SAP:P4 />
<SAP:AdditionalText>com.sap.aii.af.ra.ms.api.DeliveryException: java.lang.NullPointerException</SAP:AdditionalText>
<SAP:ApplicationFaultMessage namespace="" />
<SAP:Stack />
<SAP:Retry>M</SAP:Retry>
</SAP:Error>
Jerry

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