I am extending Rest services for IFI and implementing sample extension example, i have follow the same steps as mentioned in documentation, after copying dll file rest are start generating error "Object reference not set to an instance of an object.System.NullReferenceException: Object reference not set to an instance of an object" after all my debugging i am able reproduce same error from console application that is coming due to IResponse Interface is not mapping properties properly any one else is facing same issue