Fatal error: Uncaught Error: Class 'yii\base\Model' not found in /var/www/up.tantal-metall.com/yii_up/models/bitrix/app/Client.php:9 Stack trace: #0 {main} thrown in /var/www/up.tantal-metall.com/yii_up/models/bitrix/app/Client.php on line 9