Failed to invoke the service. Possible causes: The service is offline or inaccessible; the client-side configuration does not match the proxy; the existing proxy is invalid. Refer to the stack trace for more detail. You can try to recover by starting a new proxy, restoring to default configuration, or refreshing the service.
Error Detailes :
Retrieving the COM class factory for component with CLSID {...} failed due to the following error: 80040154 Class not registered.

namespace FlocalDamWCF
{
    [DataContract]
    public class CROConnection
    {
        [DataMember]
        public string DatabaseName { get; set; }
        [DataMember]
        public string UserName { get; set; }
        [DataMember]
        public string UserPassword { get; set; }
    }
}

namespace FlocalDamWCF
{
    [DataContract]
    public class CRORequest
    {
        [DataMember]
        public DateTime DateFrom { get; set; }
        [DataMember]
        public List<double> Values { get; set; }
    }
}

namespace FlocalDamWCF
{
    [ServiceContract]
    public interface IFlocalDAMService
    {
        [OperationContract]
        int ErrorNumber();
        [OperationContract]
        string ErrorMessage();

        [OperationContract]
        bool ConnectToCRO(CROConnection croConnection);
        [OperationContract]
        bool LoadINFHourlyData(CRORequest croRequest);
    }
}

namespace FlocalDamWCF
{
    [ServiceBehavior(InstanceContextMode = InstanceContextMode.Single)]
    public class FlocalDAMService : IFlocalDAMService
    {
        private CROConnection croConnection = new CROConnection();
        private CRORequest croRequest = new CRORequest();
        private FlocalDAM.clsConnection flocalDamConnection = null;
        private FlocalDAM.clsRequest flocalDamRequest = null;

        public FlocalDAMService()
        {
            flocalDamConnection = new FlocalDAM.clsConnection();

        }
        bool IFlocalDAMService.ConnectToCRO(CROConnection croConnection)
        {
            return ConnectToCRO(croConnection.DatabaseName, croConnection.UserName, croConnection.UserPassword);
        }
        private bool ConnectToCRO(string databaseName, string userName, string userPassword)
        {
            flocalDamConnection.Connect(databaseName, userName, userPassword);
        }
        bool IFlocalDAMService.LoadINFHourlyData(CRORequest croRequest)
        {
            flocalDamRequest = new FlocalDAM.clsRequest();

            isSuccess = flocalDamConnection.Connect(croConnection.DatabaseName, croConnection.UserName, croConnection.UserPassword);

            if (isSuccess)
            {
                flocalDamRequest.SetAssetType(CRO_ASSET_TYPE_RESERVOIR); ...
       }

<?xml version="1.0"?>
<configuration>
    <system.serviceModel>
        <services>
            <service name="FlocalDamWCF.FlocalDAMService">
                <clear/>
                <endpoint address="net.pipe://localhost/FlocalDam/FlocalDAMService" binding="netNamedPipeBinding" bindingConfiguration="" name="" contract="FlocalDamWCF.IFlocalDAMService"/>
                <host>
                    <baseAddresses>
                        <add baseAddress="http://localhost:8732/Design_Time_Addresses/FlocalDam/FlocalDAMService/"/>
                    </baseAddresses>
                </host>
            </service>
        </services>
      <behaviors>
        <serviceBehaviors>
          <behavior>
            <serviceMetadata httpGetEnabled="True"/>
            <serviceDebug includeExceptionDetailInFaults="True"/>
          </behavior>
        </serviceBehaviors>
      </behaviors>
    </system.serviceModel>
<startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/></startup></configuration>