I'm developing and app with Xamarin and I'm trying to follow [this guide](https://learn.microsoft.com/it-it/xamarin/xamarin-forms/app-fundamentals/dependency-service/introduction) in order to implement and interface for Xamarin Forms for UWP.

So I wrote in PCL this interface:

```
namespace MyApp {
public interface ISimplePdfLoader {

    void OpenLocal(string uri);

    void Load(object pdfDoc);
  }
}

```

and in MyApp.UWP I created a class:

```
[assembly: Dependency(typeof(SimplePdfLoader))]
namespace MyApp.UWP {
public class SimplePdfLoader : ISimplePdfLoader {

    public async void OpenLocal(string uri) {
        ...

        Load(doc);
    }

    public async void Load(object pdfObj) {
        ...
        }
    }
}
}

```

But it continues to show the `error CS7036 No arguments matching the mandatory formal parameter 'loadHintArgument' of 'DependencyAttribute.DependencyAttribute (string, LoadHint)'` were specified MyApp.UWP C:\Users...\workspace\my-app\MyApp\MyApp.UWP\SimplePdfLoader.cs 19
and I can not compile the project. 

**edit:** The error is show underlying the line `[assembly: Dependency(typeof(SimplePdfLoader))]`