E/Volley: [190] BasicNetwork.performRequest: Unexpected response code 401, it shows on my android studio

currently i am writing a login and register function for my app, i followed the tutorial on youtube and tried the same code as provided.

this is my code of loginactivity java class.

public class LoginActivity extends AppCompatActivity {

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

        final EditText etUseame = (EditText) findViewById(R.id.etUseame);
        final EditText etPassword = (EditText) findViewById(R.id.etPassword);
        final Button bLogin= (Button) findViewById(R.id.bLogin);
        final TextView RegisterLink= (TextView) findViewById(R.id.tvRegisterHere);

        RegisterLink.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent RegisterIntent = new Intent(LoginActivity.this, RegisterActivity.class);
                LoginActivity.this.startActivity(RegisterIntent);
            }
        });
        bLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                final String useame = etUseame.getText().toString();
                final String password = etPassword.getText().toString();

                // Response received from the server
                Response.Listener<String> responseListener = new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        try {
                            JSONObject jsonResponse = new JSONObject(response);
                            boolean success = jsonResponse.getBoolean("success");

                            if (success) {
                                String useame = jsonResponse.getString("useame");
                                Intent intent = new Intent(LoginActivity.this, Dashboard.class);
                                intent.putExtra("useame", useame);
                                LoginActivity.this.startActivity(intent);
                            } else {
                                AlertDialog.Builder builder = new AlertDialog.Builder(LoginActivity.this);
                                builder.setMessage("Login Failed")
                                        .setNegativeButton("Retry", null)
                                        .create()
                                        .show();
                            }

                        } catch (JSONException e) {
                            e.printStackTrace();
                        }
                    }
                };

                LoginRequest loginRequest = new LoginRequest(useame, password, responseListener);
                RequestQueue queue = Volley.newRequestQueue(LoginActivity.this);
                queue.add(loginRequest);
            }
        });
    }

My LoginRequest java class

public class LoginRequest extends StringRequest {
    private static final String LOGIN_REQUEST_URL = "https://n000000.scm.ssss.ac.uk/FYP/Login.php";
    private Map<String, String> params;

    public LoginRequest(String useame, String password, Response.Listener<String> listener) {
        super(Method.POST, LOGIN_REQUEST_URL, listener, null);
        params = new HashMap<>();
        params.put("useame", useame);
        params.put("password", password);
    }

    @Override
    public Map<String, String> getParams() {
        retu params;
    }
}

my php file.

<?php

    $con = mysqli_coect("host", "database", "password", "user");

    $Useame = $_POST["useame"];
    $Password = $_POST["password"];

    $statement = mysqli_prepare($con, "SELECT * FROM User WHERE useame = ? AND password = ?");
    mysqli_stmt_bind_param($statement, "ss", $Useame, $Password);
    mysqli_stmt_execute($statement);

    mysqli_stmt_store_result($statement);
    mysqli_stmt_bind_result($statement, $Useame, $Password);

    $response = array();
    $response["success"] = false;  

    while(mysqli_stmt_fetch($statement)){
        $response["success"] = true;  
        $response["useame"] = $Useame;
        $response["password"] = $Password;
    }

    print_r(json_encode($response));
?>

Finally, when i click on the login button, nothing happened on screen, in the monitor log, there is a red line

05-19 18:17:08.308 14485-14805/fyp.pau.regover E/Volley: [190] BasicNetwork.performRequest: Unexpected response code 401 for https://n000000.scm.ssss.ac.uk/FYP/Login.php 

when i click on the link https://n000000.scm.ssss.ac.uk/FYP/Login.php it shows the script below.

Notice: Undefined index: User.Useame in /web/users/n000000/FYP/Login.php on line 5 Notice: Undefined index: User.Password in /web/users/n000000/FYP/Login.php on line 6 Waing: mysqli_stmt_bind_result(): Number of bind variables doesn't match number of fields in prepared statement in /web/users/n000000/FYP/Login.php on line 13 {"success":false}

it is so urgent, could anyone help me to solve this please Thanks!