Run-time error VB6

I have a DLL that was created in .NET and I need it to run as COM +.

.NET code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace thiago.dll.NET
{
    public class dllNET
    {
         public String retornoString()
         {
               return "retorno";
         }
    }
}

COM + adaptation code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;

namespace thiago.dll.NET.COMPLUS
{
    [ComVisible(true), InterfaceType(ComInterfaceType.InterfaceIsDual),
    Guid("2382A011-76E7-4729-A8C9-A016465DCA19")]
    public interface IStringRetorno
    {
        String retornoString();
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;

namespace thiago.dll.NET.COMPLUS
{
    [ComVisible(true), ClassInterface(ClassInterfaceType.None),
    Guid("7457F910-D91C-4378-91CD-D768A32FF339")]
    public class StringRetorno : IStringRetorno
    {
        thiago.dll.NET.dllNET obj = new thiago.dll.NET.dllNET();
        public StringRetorno()
        {

        }

        [ComVisible(true)]
        public String retornoString()
        {
            return obj.retornoString();
        }
    }
}

To explain better I did a DLL in .NET and I want it to run in VB6, but for this I needed to create another DLL (which turned into a Tlb that is read in VB6) where VB6 can see the methods and apply them. What I realized is that when I referenced the DLL made in .NET in that other DLL, it takes the dll file where the method is, how will VB6 read this dll?

I made the Strong Name Key , I checked the Register For COM interop option, I referenced in the project the DLL made in .NET, I left as Global Assembly (GAC) and added them in Component Services (Library Application (COM + Application) but at the time of use in VB6 it gives Erro em tempo de execução: Erro de automação

Is there another way to do this?

Edit: I made a simple COM + DLL without needing to reference another .NET DLL and when I was playing in VB6 it worked. Can the problem be the reference in COM + of the .NET DLL?