I can not Parser Retrofit

Hello, I'm all trying to read a json file with retrofit and then save it in sqllite, but when the project is implemented the app closes

I have the Customers class, they are more fields but that's how the structure goes, with its respective set-to-get.

@SerializedName("CMA_CODIGO")
@Expose
private String cMACODIGO;
@SerializedName("CMA_TIPO_CLIENTE")
@Expose
private String cMATIPOCLIENTE;
@SerializedName("CMA_NOMBRE")
@Expose
private String cMANOMBRE;

The interface is like this.

public interface RetrofitClientesArray {
/*
    * Retrofit get annotation with our URL
    * And our method that will return us details of student.
   */
@GET("cspm/clientes.json")
Call<List<clientes>> getClientesDetails();

}

In the main is the function to read like this.

private  void getRetrofitClientes(){
    Retrofit retrofit = new Retrofit.Builder()
            .baseUrl("http://tucuenca.com/")
            .addConverterFactory(GsonConverterFactory.create())
            .build();

            RetrofitClientesArray service = retrofit.create(RetrofitClientesArray.class);
            Call<List<clientes>> call = service.getClientesDetails();

            call.enqueue(new Callback<List<clientes>>() {

                @Override
                public void onResponse(Call<List<clientes>> call, Response<List<clientes>> response) {

                    try{
                        Log.d("Exito ", "Leyendo");
                    }catch (Exception e){
                        Log.d("onResponse", "There is an error");
                        e.printStackTrace();
                    }
                }

                @Override
                public void onFailure(Call<List<clientes>> call, Throwable t) {
                    Log.d("onFailure", t.toString());
                    showLoginError(t.toString());
                }
            });
    }

When I run the logcat it gives me this message

04-19 13:12:59.778 32209-32209/com.---.ventas3.spm I/art: Late-enabling -Xcheck:jni 04-19 13:12:59.778

     

32209-32209 / com .---. sales3.spm I / art: Reinit property:   dalvik.vm.checkjni = false 04-19 13: 12: 59.907 32209-32209 /? W / System:   ClassLoader referenced unknown path:   /data/app/com.---.sales3.spm-2/lib/arm64 04-19 13: 12: 59.908   32209-32209 /? W / art: JIT profile information will not be recorded:   profile file does not exits. 04-19 13: 12: 59.915 32209-32209 /?   I / InstantRun: starting instant run server: is main process 04-19   13: 12: 59.934 32209-32209 /? I / HwCust: Constructor found for class   android.app.HwCustActivityImpl 04-19 13: 12: 59.948 32209-32209 /?   I / HwCust: Constructor found for class   android.app.HwCustHwWallpaperManagerImpl 04-19 13: 12: 59.961   32209-32209 /? W / art: Before Android 4.1, method   android.graphics.PorterDuffColorFilter   android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter (android.graphics.PorterDuffColorFilter,   android.content.res.ColorStateList, android.graphics.PorterDuff $ Mode)   would have incorrectly overridden the package-private method in   android.graphics.drawable.Drawable 04-19 13: 13: 00.142 32209-32209 /?   I / HwSecImmHelper: mSecurityInputMethodService is null 04-19   13: 13: 00.145 32209-32209 /? I / HwPointEventFilter: support AFT 04-19   13: 13: 00.154 32209-32271 /? I / Process: Sending signal. PID: 32209 SIG:   9