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wcf error extension could not be loaded

System.Configuration.ConfigurationErrorsException: The type 'InMotionGIT_NT.Address.Service, CustomHeaders, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' registered for extension 'customHeaders' could not be loaded. (C:UsersjmachadoDocumentsVisual Studio 2010ProjectsInMotionGIT_NTAddress ServiceInMotionGIT_NT.Address.ServicebinDebugInMotionGIT_NT.Address.Service.dll.config line 67)

       

<endpointBehaviors>

    <behavior name="jsonBehavior">

      <enableWebScript/>

      <customHeaders/>

      <!--<webHttp/>-->

    </behavior>

  </endpointBehaviors>

       

<behaviorExtensions>

    <add name="customHeaders" type="InMotionGIT_NT.Address.Service, CustomHeaders, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"/>

  </behaviorExtensions>

       

[AttributeUsage(AttributeTargets.Class)]

public class CustomHeaders : IDispatchMessageInspector

{

 

    public object AfterReceiveRequest(ref System.ServiceModel.Channels.Message request, System.ServiceModel.IClientChannel channel, System.ServiceModel.InstanceContext instanceContext)

    {

        if ((WebOperationContext.Current.IncomingRequest.Method == "GET")) {

            WebOperationContext.Current.OutgoingResponse.Headers.Add("Access-Control-Allow-Origin", "*");

            WebOperationContext.Current.OutgoingResponse.Headers.Add("Access-Control-Allow-Methods", "POST");

            WebOperationContext.Current.OutgoingResponse.Headers.Add("Access-Control-Allow-Headers", "Content-Type, Accept");

        }

        return null;

    }

 

 

    public void BeforeSendReply(ref System.ServiceModel.Channels.Message reply, object correlationState)

    {

    }

}

       

<behaviorExtensions>

    <add name="customHeaders" type="InMotionGIT_NT.Address.Service.CustomHeaders, <DLLName> , Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />

</behaviorExtensions>