Fatal error: Uncaught Error: Class 'yii\db\ColumnSchemaBuilder' not found in /var/www/html/autocar/vendor/yiisoft/yii2/db/mysql/ColumnSchemaBuilder.php:18 Stack trace: #0 {main} thrown in /var/www/html/autocar/vendor/yiisoft/yii2/db/mysql/ColumnSchemaBuilder.php on line 18