Fatal error: Uncaught Error: Class 'yii\db\Migration' not found in /home/wittyly/public_html/live/hr-witty/migrations/m190729_104543_add_request_budget_id_column_to_request_leave_table.php:8 Stack trace: #0 {main} thrown in /home/wittyly/public_html/live/hr-witty/migrations/m190729_104543_add_request_budget_id_column_to_request_leave_table.php on line 8