Error in two-way WCF-Port without using Orchestration

I want to pass the response from WCF to BizTalk .

My Itinerary is

OnRamp(One way Receive Port ) ->开发者_Python百科Message Transform(Mapping) ->UDDI Resolver ->Off Ramp(Two WaySend Port)

Am calling WCF and getting the response ,after that am getting below error

A response message sent to adapter "WCF-BasicHttp" on Receive Location: "DynamicResolutionTwoWay" with URI:"http://pc133056.cts.com/TwoWayAllocation/CRMDetailService.svc" is suspended. Error details: There was a failure executing the response(receive) pipeline: "Microsoft.Practices.ESB.Itinerary.Pipelines.ItinerarySelectSendReceive, Microsoft.Practices.ESB.Itinerary.Pipelines, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" Source: "ESB Itinerary Selector" Send Port: "DynamicResolutionTwoWay" URI: "http://pc133056.cts.com/TwoWayAllocation/CRMDetailService.svc" Reason: Value cannot be null. Parameter name: config

Here am getting response from WCF, after that it passing the data again and getting the above error

How to get rid of this error?

With an itinerary select pipeline, don't you need to configure the itinerary selector component of it so it can determine which itinerary to select?