WCF service gives me an error

I have a WCF service that i am trying to test using SOAP Ui Pro . I have a licensed copy but everytime i get like an error back .Its a custom binding Service.. Any help


HTTP/1.1 415 Cannot process the message because the content type 'application/soap+xml;charset=UTF-8;action="http://tempuri.org/IGeocachingOAuth/CreateFieldNoteAndPublishByDeviceV1"' was not the expected type 'application/soap+msbin1'.
Cache-Control: private
Server: Microsoft-IIS/7.0
X-AspNet-Version: 4.0.30319
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Date: Thu, 18 Nov 2010 17:47:12 GMT
Content-Length: 0