Exception when trying to use MockServices

I get this exception when I'm I execute the request pointing to the mock response.

Tue Dec 18 10:25:41 PST 2007:ERROR:com.eviware.soapui.impl.wsdl.mock.DispatchException: Failed to find matching operation for request
  com.eviware.soapui.impl.wsdl.mock.DispatchException: Failed to find matching operation for request
  at com.eviware.soapui.impl.wsdl.mock.WsdlMockRunner.dispatchMockRequest(WsdlMockRunner.java:264)
  at com.eviware.soapui.impl.wsdl.mock.WsdlMockRunner.dispatchMockRequest(WsdlMockRunner.java:56)
  at com.eviware.soapui.monitor.MockEngine$ServerHandler.handle(MockEngine.java:276)
  at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
  at org.mortbay.jetty.Server.handle(Server.java:313)
  at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:506)
  at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:844)
  at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:644)
  at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
  at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
  at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:396)
  at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:442)