Android-get-error-body-response-retrofit.java

// Way 1

public void onError(Throwable e){
    Gson gson = new Gson();
    TypeAdapter<YourResponseModel> adapter = gson.getAdapter(YourResponseModel.class);
    try {
        if (response.errorBody() != null)
            registerResponse = 
                adapter.fromJson(
                    response.errorBody().string());
    } catch (IOException e) {
        e.printStackTrace();
    }
}

// Way 2

public void onError(Throwable e) {
       if (e instanceof HttpException) {
           HttpException exception = (HttpException) e;
           Response response = exception.response();
           try {
               JSONObject jsonObject = new  JSONObjec(response.errorBody().string());
               Log.e("Error ","" + jsonObject.optString("message"));
            } catch (JSONException e1) {
               e1.printStackTrace();
            } catch (IOException e1) {
                e1.printStackTrace();
            }
     }
 }