Fatal error: Uncaught Error: Class 'yii\base\Model' not found in /var/www/up.tantal-metall.com/yii_up/modules/app_download_products/models/ImporterExcel.php:13 Stack trace: #0 {main} thrown in /var/www/up.tantal-metall.com/yii_up/modules/app_download_products/models/ImporterExcel.php on line 13