attempting to implement an inaccessible interface

[BackT0TheFuture]

Please provide a minimal compilable example of

just a simple native code

typedef void(*ActionCallback)();

__declspec(dllexport) void RunCallback(ActionCallback callback)
{
	callback();
}

using System;

namespace Invoker
{
    using AdvancedDLSupport;

    class Program
    {
        public delegate void ActionCallback();

        public interface ITest
        {
            void RunCallback(ActionCallback callback);
        }

        static void Main(string[] args)
        {
            const string MyLibraryName = "native.dll";
            var library = NativeLibraryBuilder.Default.ActivateInterface<ITest>(MyLibraryName);
            library.RunCallback(() => Console.WriteLine("Callback ran!"));
        }
    }
}

dotnet Invoker.dll

Unhandled Exception: System.TypeLoadException: Type 'Generated_NativeLibraryBase
_a6553129_a2dc_4c8c_a872_7c2dc3c740bd' from assembly 'DLSupportDynamicAssembly,
Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' is attempting to implemen
t an inaccessible interface.
   at System.Reflection.Emit.TypeBuilder.TermCreateClass(RuntimeModule module, I
nt32 tk, ObjectHandleOnStack type)
   at System.Reflection.Emit.TypeBuilder.CreateTypeNoLock()
   at System.Reflection.Emit.TypeBuilder.CreateTypeInfo()
   at AdvancedDLSupport.NativeLibraryBuilder.ActivateClass(String libraryPath, T
ype baseClassType, Type[] interfaceTypes)
   at AdvancedDLSupport.NativeLibraryBuilder.ActivateClass[TClass,TInterface](St
ring libraryPath)
   at AdvancedDLSupport.NativeLibraryBuilder.ActivateInterface[TInterface](Strin
g libraryPath)
   at Invoker.Program.Main(String[] args) in d:\Invoker\Program.cs:line 26

Desktop (please complete the following information):

• OS: windows 8.1 64bit
• Runtime .NET Core
• Version 2.2

Additional context
Add any other context about the problem here.

[Nihlus]

Your interface is nested inside a private class. It is not accessible to ADL. Move it outside of the class, or make the class public.

[BackT0TheFuture]

my bad, thanks!