java.lang.String does not convert it to JSONObject as I can fix it?

I want to make the query to the remote database but it sends me an error that it can not convert to JSONObject I have tried with several methods but nothing

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_inicio__sesion);

    loading=findViewById(R.id.loading);
    Nombre=findViewById(R.id.TV_usu);
    Password=findViewById(R.id.TV_pass);
    btn_iniciar=findViewById(R.id.Btn_iniciar);
    tv_registro= findViewById(R.id.tv_registro);

    btn_iniciar.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            String mNom = Nombre.getText().toString().trim();
            String mPass = Password.getText().toString().trim();

            if (!mNom.isEmpty() || !mPass.isEmpty()){
                Login(mNom, mPass);

            }else{
                Nombre.setError("favor de verificar Nombre");
                Password.setError("favor de verificar Contraseña");
            }
        }
    });

    tv_registro.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent intentreg=new Intent(Inicio_Sesion.this, Registro.class);
            Inicio_Sesion.this.startActivity(intentreg);
        }
    });
}
private void Login (final String Nombre, final String Password){
    loading.setVisibility(View.VISIBLE);
    btn_iniciar.setVisibility(View.GONE);

    StringRequest stringRequest = new StringRequest(Request.Method.POST, URL_LOGIN,
            new Response.Listener<String>() {
                @Override
                public void onResponse(String response) {
                    try {
                        JSONObject jsonObject = new JSONObject(response);
                        String success = jsonObject.getString("success");
                        JSONArray jsonArray = jsonObject.getJSONArray("login");



                        if (success.equals("1")){
                            for (int i=0; i < jsonArray.length(); i++){

                                JSONObject object = jsonArray.getJSONObject(i);

                                String Nombre = object.getString("Nombre").trim();
                                String Password = object.getString("Password").trim();

                                Toast.makeText(Inicio_Sesion.this,
                                        "SUCCESS LOGIN. \nTU NOMBRE: "
                                        +Nombre+"\n TU CONTRASEÑA: "
                                        +Password, Toast.LENGTH_SHORT)
                                        .show();

                                loading.setVisibility(View.GONE);
                            }
                        }

                    }catch (JSONException e){
                        e.printStackTrace();
                        loading.setVisibility(View.GONE);
                        btn_iniciar.setVisibility(View.VISIBLE);
                        Toast.makeText(Inicio_Sesion.this, "ERROR "+e.toString(), Toast.LENGTH_SHORT).show();



                    }
                }
            },
            new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    loading.setVisibility(View.GONE);
                    btn_iniciar.setVisibility(View.VISIBLE);
                    Toast.makeText(Inicio_Sesion.this, "ERROR22 "+error.toString(), Toast.LENGTH_SHORT).show();

                }
            })

    {
        @Override
        protected Map<String, String> getParams() throws AuthFailureError {
            Map<String, String> params = new HashMap<>();
                    params.put("Nombre", Nombre);
                    params.put("Password", Password);
                    return params;
        }
    };


    RequestQueue requestQueue = Volley.newRequestQueue(this);
    requestQueue.add(stringRequest);

    stringRequest.setRetryPolicy(new RetryPolicy() {
        @Override
        public int getCurrentTimeout() {
            return 50000;
        }

        @Override
        public int getCurrentRetryCount() {
            return 50000;
        }

        @Override
        public void retry(VolleyError error) throws VolleyError {

        }
    });

}

this is the login.php

<?php

if($_SERVER ['REQUEST_METHOD']== 'POST'){

$Usuario = $_POST['Usuario'];
$Password = $_POST['Password'];

require_once 'functions.php';

$sql = "SELECT * FROM user WHERE Usuario='$Usuario' ";

$reponse = mysqli_query($conn, $sql);

$reult = array();
$reult['login'] = array();

if (mysqli_num_rows($reponse) === 1 ){

    $row = mysqli_fetch_assoc($reponse);

    if ( password_verify($Password, $row['Password'])){

        $index['Nombre'] = $row['Nombre'];
        $index['Password'] = $row['Password'];

        array_push($result['login'], $index);

        $result['success'] = "1";
        $result['message'] = "succes";


        echo json_encode($result);


        mysqli_close($conn);

    }else {
        $result['success'] = "0";
        $result['message'] = "error";
        echo json_encode($result);

        mysqli_close($conn);
    }
}
}
?>