NW BPM: Error while testing

Hello All,

I have a PO system (PI JAVA + BPM+ BRM) in my landscape.

Recently, i developed a simple NW-BPM process and it deployed successfully on PI server also.  Now, when i am testing the interface i am getting below error in BPM-SOAP receiver XI3.0 channel.

Error in call over HTTP: HTTP 403 Forbidden[EXCEPTION] java.io.IOException: invalid content type for SOAP: TEXT/HTML; HTTP 403 Forbidden

I am not sure why the message is not entering into the BPM process (start step) and throwing above exception?

Thanks

Amit Srivastava