Problem with Retrofit Return on Android

Question

I’m trying to connect to the local network, using the RetroFit. In the local network I have a Rest that returns a json, but when I run the event to make it happen, an error happens

I have an interface class for Retrofit

public interface iRetroFitSibcom {

    @GET("/{categoria}")
    Call<List<Categoria>> getCategorias(@Path("categoria") String categoria); 

    public static final Retrofit retrofit = new Retrofit.Builder()
            .baseUrl("http://10.0.2.2:8080/sibcomslim")
            .addConverterFactory(GsonConverterFactory.create())
            .build();
}

And a button where the event takes place

@Override
public void onClick(View v) {
    iRetroFitSibcom githubUser = iRetroFitSibcom.retrofit.create(iRetroFitSibcom.class);
    final Call <List<Categoria>> call = githubUser.getCategorias("categorias");
    call.enqueue(new Callback<List<Categoria>>() {
        @Override
        public void onResponse(Call<List<Categoria>> call, Response<List<Categoria>> response) {
            int code = response.code();
            if (code == 200) {
                List<Categoria> lista = response.body();
                for (Categoria categoria : lista) {
                    Log.d("MainActivity", categoria.descricao);
                }
            }
            else {
                Toast.makeText(getBaseContext(), "Falha: " + String.valueOf(code),
                Toast.LENGTH_LONG).show();
            }
        }

        @Override
        public void onFailure(Call<List<Categoria>> call, Throwable t) {

        }
    });
}

But when I do this nothing happens, I do not see error message or showing the descriptions in Log. d.

However, the following information is uploaded

08-21 14:41:59.637 6491-6491/dev.sbruno.sibcom I/Choreographer: Skipped 36 frames! The application may be Doing Too Much work on its main thread. 08-21 14:42:04.622 6491-6491/dev.sbruno.sibcom D/Networksecurityconfig: No Network Security Config specified, using Platform default 08-21 14:42:17.388 6491-6496/dev.sbruno.sibcom I/art: Do partial code cache Collection, code=30KB, data=28KB 08-21 14:42:17.391 6491-6496/dev.sbruno.sibcom I/art: After code cache Collection, code=23KB, date=25KB 08-21 14:42:17.391 6491-6496/dev.sbruno.sibcom I/art: Increasing code cache Capacity to 128KB

What is going wrong? even trying to debug can’t do as it is not possible to access the lines I put to debug, it doesn’t even reach them

Edit

I just added a Toast on onFailure and checked that the code is going through there, so there must be some error in the connection is this?

@Override
public void onFailure(Call<List<Categoria>> call, Throwable t) {
      Toast.makeText(getBaseContext(), "Falhou ao me conectar ",
      Toast.LENGTH_LONG).show();