org.json.JSONException中的错误：类型为org.json.JSONArray的错误无法转换为JSONObject

  StringRequest stringRequest = new StringRequest(
                Request.Method.POST,
                Configs.Login,
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        progressDialog.dismiss();
                        try {
                            JSONObject obj = new JSONObject(response);
                            if(!obj.getBoolean("error")){

                                startActivity(new Intent(getApplicationContext(), MainActivity.class));
                                finish();
                            }else{
                                Toast.makeText(
                                        getApplicationContext(),
                                        obj.getString("message"),
                                        Toast.LENGTH_LONG
                                ).show();
                            }
                        } catch (JSONException e) {
                            e.printStackTrace();
                        }
                    }
                },
                new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        progressDialog.dismiss();

                        Toast.makeText(
                                getApplicationContext(),
                                error.getMessage(),
                                Toast.LENGTH_LONG
                        ).show();
                    }
                }
        )
            @Override
  StringRequest stringRequest = new StringReque