SOAP: error occured: java.io.IOException: invalid content type for SOAP

Hi gurus,

i have synchronus scenario with flow as  soap --> PI 7.31 java only --> proxy.

I am getting the below error in the message monitering.

Exception caught by adapter framework: java.io.IOException: Error receiving or parsing request message: java.io.IOException: HTTP Error response for SOAP request or invalid content-type.

Any suggestions are appreciated.