Error : com.sap.engine.interfaces.messaging.api.exception.MessagingException:

Hi Everyone,

I'm new in PO Developement and I am getting this error:

please explain me what it means:

Im trying to send an wsd file through webservice Adapter.

Failed to call the endpoint: Error in call over
HTTP: HTTP 200 OK

Die Message konnte nicht über Verbindung
File_http://sap.com/xi/XI/System an Endpunkt <local> übertragen werden
wegen: com.sap.engine.interfaces.messaging.api.exception.MessagingException:
java.io.IOException: No SOAP Envelope but 1
{http://schemas.xmlsoap.org/wsdl/}definitions; HTTP 200 OK