PHP Notice – yii\base\ErrorException

                            }
 
        $this->registerSessionHandler();
 
        $this->setCookieParamsInternal();
 
        YII_DEBUG ? session_start() : @session_start();
 
        if ($this->getIsActive()) {
            Yii::info('Session started', __METHOD__);
            $this->updateFlashCounters();
        } else {
            $error = error_get_last();
                

                         * @param string $key the session variable name
     * @param mixed $defaultValue the default value to be returned when the session variable does not exist.
     * @return mixed the session variable value, or $defaultValue if the session variable does not exist.
     */
    public function get($key, $defaultValue = null)
    {
        $this->open();
        return isset($_SESSION[$key]) ? $_SESSION[$key] : $defaultValue;
    }
 
    /**
     * Adds a session variable.
     * If the specified name already exists, the old value will be overwritten.
                

                         * Resolves the current request into a route and the associated parameters.
     * @return array the first element is the route, and the second is the associated parameters.
     * @throws NotFoundHttpException if the request cannot be resolved.
     */
    public function resolve()
    {
        $result = Yii::$app->getUrlManager()->parseRequest($this);
        if ($result !== false) {
            list($route, $params) = $result;
            if ($this->_queryParams === null) {
                $_GET = $params + $_GET; // preserve numeric keys
            } else {
                $this->_queryParams = $params + $this->_queryParams;
                

                         * @throws NotFoundHttpException if the requested route is invalid
     */
    public function handleRequest($request)
    {
        if (empty($this->catchAll)) {
            try {
                list($route, $params) = $request->resolve();
            } catch (UrlNormalizerRedirectException $e) {
                $url = $e->url;
                if (is_array($url)) {
                    if (isset($url[0])) {
                        // ensure the route is absolute
                        $url[0] = '/' . ltrim($url[0], '/');
                

                        {
        try {
            $this->state = self::STATE_BEFORE_REQUEST;
            $this->trigger(self::EVENT_BEFORE_REQUEST);
 
            $this->state = self::STATE_HANDLING_REQUEST;
            $response = $this->handleRequest($this->getRequest());
 
            $this->state = self::STATE_AFTER_REQUEST;
            $this->trigger(self::EVENT_AFTER_REQUEST);
 
            $this->state = self::STATE_SENDING_RESPONSE;
            $response->send();