How to show response errorBody in Retrofit on Android

Question

In my app, I want to use Retrofit2 to connect to the server and get some data.

For this, I've written the code as shown below but it doesn't show the data. And for some reason, no (detailed) error is outputted.

 private void getDetailData(String auctionID, final String jwtToken) {
        showLoading(true);
        Call<DetailResponse> call = apis.getDetainAuctions(auctionID, jwtToken, agent);
        call.enqueue(new Callback<DetailResponse>() {
            @Override
            public void onResponse(Call<DetailResponse> call, final Response<DetailResponse> response) {
                Log.e("detailLog", "OK");
                Log.e("detailLog", response.message() + " --- " + response.errorBody());
                if (response.isSuccessful()) {

                }
            }

            @Override
            public void onFailure(Call<DetailResponse> call, Throwable t) {
                Log.e("detailLog", "Err : " + t.getMessage());
            }
        });
    }

Logcat error:

E/detailLog:  --- okhttp3.ResponseBody$1@cbf85bc

What does the error mean?