I've created a Self-Hosted Web Service but it seems the client can't retrieve the result properly.

The Web-service method successfully captures the input parameters and generate the expected result before sending it back to the client application.

This is the error message in the client side:
An error occurred while receiving the HTTP response to http://localhost:8001/PRG/HTTP. This could be due to the service endpoint binding not using the HTTP protocol. This could also be due to an HTTP request context being aborted by the server (possibly due to the service shutting down). See server logs for more details.