Unable to run first WCF service - wcf

Question

This is my first WCF service and I am getting an error:
Failed to add a service. Service metadata may not be accessible. Make sure your service is running and exposing metadata.
Code:
namespace WcfMathServiceLibrary
{
[ServiceContract]
public interface IMath
{
[OperationContract]
double Add(double i, double j);
[OperationContract]
double Sub(double i, double j);
[OperationContract]
Complex AddComplexNo(Complex i, Complex j);
[OperationContract]
Complex SubComplexNo(Complex i, Complex j);
}
[DataContract]
public class Complex
{
private int _real;
private int _imaginary;
[DataMember]
public int real { get; set; }
[DataMember]
public int imaginary { get; set; }
}
namespace WcfMathServiceLibrary
{
public class MathService : IMath
{
public double Add(double i, double j)
{
return (i + j);
}
public double Sub(double i, double j)
{
return (i - j);
}
public Complex AddComplexNo(Complex i, Complex j)
{
Complex result = new Complex();
result.real = i.real + j.real;
result.imaginary = i.imaginary + j.imaginary;
return result;
}
public Complex SubComplexNo(Complex i, Complex j)
{
Complex result = new Complex();
result.real = i.real - j.real;
result.imaginary = i.imaginary - j.imaginary;
return result;
}
}
Web.Config
<?xml version="1.0"?>
<configuration>
<system.web>
<compilation debug="true" targetFramework="4.0" />
</system.web>
<system.serviceModel>
<services>
<service name="WcfMathServiceLibrary.MathService">
<host>
<baseAddresses>
<add baseAddress="http://localhost:8732/WcfMathServiceLibrary/MathService/"/>
</baseAddresses>
</host>
<endpoint address="" binding="wsHttpBinding" contract="WcfMathServiceLibrary.MathService">
<identity>
<dns value="localhost" />
</identity>
</endpoint>
<endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" >
</endpoint>
</service>
</services>
<behaviors>
<serviceBehaviors>
<behavior>
<!-- To avoid disclosing metadata information, set the value below to false and remove the metadata endpoint above before deployment -->
<serviceMetadata httpGetEnabled="true"/>
<!-- To receive exception details in faults for debugging purposes, set the value below to true. Set to false before deployment to avoid disclosing exception information -->
<serviceDebug includeExceptionDetailInFaults="false"/>
</behavior>
</serviceBehaviors>
</behaviors>
<serviceHostingEnvironment multipleSiteBindingsEnabled="true" />
</system.serviceModel>
<system.webServer>
<modules runAllManagedModulesForAllRequests="true"/>
</system.webServer>
</configuration>
I am not sure what is the issue. Could you please guide me?

Answer 1

I think your contract may need to point to the interface and not the concrete implementation
<endpoint address="" binding="wsHttpBinding" contract="WcfMathServiceLibrary.IMath">