Generate C# code for inteface but get class

I define an inteface and some other class in uml. when I try generate C# code I get class declaration but not an interface.
// IAnimal.cs
using System;
namespace Animals {
public class IAnimal {
public void Move() {
throw new System.Exception(“Not implemented”);
}

}

}

//cat.cs
using System;
namespace Animals {
public class Cat {
private void Run() {
throw new System.Exception(“Not implemented”);
}

}

}

what I want is like this:
// IAnimal .cs
using System;
namespace Animals {
public interface IAnimal {
void Move() ;
}
}

only version 15.X . 14.0 gives what I want.

Hi fietiger,

Are you using Instant Generator or Visual Studio Integration code synchronization?
Can you attach your class diagram?

I am using Instant Generator.Class diagram is so simple.1565599929(1)

I forwarded your reported issue to our engineer team.
Once it is fixed, I will notify you.