Fatal error: Uncaught Error: Class 'yii\db\Migration' not found in /home/wittyly/public_html/staging/hr-witty/migrations/m190701_080554_create_table_session.php:5 Stack trace: #0 {main} thrown in /home/wittyly/public_html/staging/hr-witty/migrations/m190701_080554_create_table_session.php on line 5