Fatal error: Uncaught Error: Class 'yii\db\ActiveRecord' not found in /opt/lampp/htdocs/tienda.apirest/modules17/core/models/TransactionPayQR.php:8 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/tienda.apirest/modules17/core/models/TransactionPayQR.php on line 8