Fatal error: Declaration of app\components\WebUser::levelList() must be compatible with user\components\WebUser::levelList(): array in /usr/local/www/apache24/data/yii/prelim/components/WebUser.php on line 36

Fatal error: Uncaught yii\web\HeadersAlreadySentException: Headers already sent in /usr/local/www/apache24/data/yii/prelim/components/WebUser.php on line 25. in /usr/local/www/apache24/data/yii/prelim/vendor/yiisoft/yii2/web/Response.php:369 Stack trace: #0 /usr/local/www/apache24/data/yii/prelim/vendor/yiisoft/yii2/web/Response.php(342): yii\web\Response->sendHeaders() #1 /usr/local/www/apache24/data/yii/prelim/vendor/yiisoft/yii2/web/ErrorHandler.php(136): yii\web\Response->send() #2 /usr/local/www/apache24/data/yii/prelim/vendor/yiisoft/yii2/base/ErrorHandler.php(323): yii\web\ErrorHandler->renderException(Object(yii\base\ErrorException)) #3 [internal function]: yii\base\ErrorHandler->handleFatalError() #4 {main} thrown in /usr/local/www/apache24/data/yii/prelim/vendor/yiisoft/yii2/web/Response.php on line 369