YII2 cadastramento de produtos e login de usuário

Eu tenho que fazer uma aplicação que realiza as aplicações básicas de um crud para um gerenciamento de tarefas, entrando em login com usuario e senha veria quais as tarefas que tenho para fazer ou querer cadastrar mais.

Nunca usei o yii2 e nem php, estou aprendendo, ao entrar na parte de login, me ocorre este erro :

Invalid Configuration – yii\base\InvalidConfigException
Failed to instantiate component or class "validatePassword".
↵
Caused by: ReflectionException

Dizendo que esse método não está disponivel, mas ele está
(fiz uma grande bagunça de código provavelmente)

vai aqui meu User.php(model):

<?php

namespace app\models;

use Yii;

/**
 * This is the model class for table "user".
 *
 * @property int $id
 * @property string $firstName
 * @property string $lastName
 * @property string $username
 * @property string $password
 */
class User extends \yii\db\ActiveRecord
{

    public $password;
    /**
     * {@inheritdoc}
     */
    public static function tableName()
    {
        return 'user';
    }

    /**
     * {@inheritdoc}
     */
    public function rules()
    {
        return [
            [['firstName', 'lastName', 'username', 'password'], 'required'],
            [['firstName'], 'string', 'max' => 15],
            [['lastName', 'username', 'password'], 'string', 'max' => 30],
        ];
    }

    /**
     * {@inheritdoc}
     */
    public function attributeLabels()
    {
        return [
            'id' => 'ID',
            'firstName' => 'First Name',
            'lastName' => 'Last Name',
            'username' => 'Username',
            'password' => 'Password',
        ];
    }

       /**
     * Validates password
     *
     * @param string $password password to validate
     * @return bool if password provided is valid for current user
     */
    public function validatePassword($password)
    {
        return $this->password === $password;
    }
}

<?php

namespace app\models;

use Yii;
use yii\base\Model;

/**
 * LoginForm is the model behind the login form.
 *
 * @property User|null $user This property is read-only.
 *
 */
class LoginForm extends Model
{
    public $username;
    public $password;
    public $rememberMe = true;

    private $_user = false;


    /**
     * @return array the validation rules.
     */
    public function rules()
    {
        return [
            // username and password are both required
            [['username', 'password'], 'required'],
            // rememberMe must be a boolean value
            ['rememberMe', 'boolean'],
            // password is validated by validatePassword()
            ['password', 'validatePassword'],
        ];
    }

    
}

<?php

namespace app\controllers;

use Yii;
use yii\filters\AccessControl;
use yii\web\Controller;
use yii\web\Response;
use yii\filters\VerbFilter;
use app\models\LoginForm;
use app\models\ContactForm;

class SiteController extends Controller
{
    /**
     * {@inheritdoc}
     */
    public function behaviors()
    {
        return [
            'access' => [
                'class' => AccessControl::className(),
                'only' => ['logout'],
                'rules' => [
                    [
                        'actions' => ['logout'],
                        'allow' => true,
                        'roles' => ['@'],
                    ],
                ],
            ],
            'verbs' => [
                'class' => VerbFilter::className(),
                'actions' => [
                    'logout' => ['post'],
                ],
            ],
        ];
    }

    /**
     * {@inheritdoc}
     */
    public function actions()
    {
        return [
            'error' => [
                'class' => 'yii\web\ErrorAction',
            ],
            'captcha' => [
                'class' => 'yii\captcha\CaptchaAction',
                'fixedVerifyCode' => YII_ENV_TEST ? 'testme' : null,
            ],
        ];
    }

    /**
     * Displays homepage.
     *
     * @return string
     */
    public function actionIndex()
    {
        return $this->render('index');
    }

    /**
     * Login action.
     *
     * @return Response|string
     */
    public function actionLogin()
    {
        

        if (!Yii::$app->user->isGuest) {
            return $this->goHome();
        }

        $model = new LoginForm();
        if ($model->load(Yii::$app->request->post()) && $model->login()) {
            return $this->goBack();
        }

        $model->password = '';
        return $this->render('login', [
            'model' => $model,
        ]);
    }

    /**
     * Logout action.
     *
     * @return Response
     */
    public function actionLogout()
    {
        Yii::$app->user->logout();

        return $this->goHome();
    }

    /**
     * Displays contact page.
     *
     * @return Response|string
     */
  
  
}

Site controller, alguém poderia me ajudar nos erros que estão acontecendo ?

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