public class App63 extends Application
{
private static Api63 api63;
private Retrofit retrofit;

@Override
public void onCreate() {
    super.onCreate();
    retrofit = new Retrofit.Builder().baseUrl("http://www.chat.pareto-marketing.ru/").addConverterFactory(GsonConverterFactory.create()).build();
    api63 = retrofit.create(Api63.class);
}

public static Api63 getApi() {
    return api63;
}
}

public interface Api63
{
@GET("getform")
Call<ResponseBody> getData();
}

Call<ResponseBody> list = App63.getApi().getData();

    list.enqueue(new Callback<ResponseBody>() {

            @Override
            public void onResponse(Call<ResponseBody> p1, Response<ResponseBody> p2)
            {
                try
                {
                    Log.d("$", p2.body().string());
                }
                catch (IOException e)
                {}
            }

            @Override
            public void onFailure(Call<ResponseBody> p1, Throwable p2)
            {
                // TODO: Implement this method
            }
        });
}
}

java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String okhttp3.ResponseBody.string()' on a null object reference