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Warning: Undefined variable $exception in /var/www/html/vendor/yiisoft/yii2/views/errorHandler/error.php on line 10

Fatal error: Uncaught Error: Call to a member function getCode() on null in /var/www/html/vendor/yiisoft/yii2/views/errorHandler/error.php:10 Stack trace: #0 {main} thrown in /var/www/html/vendor/yiisoft/yii2/views/errorHandler/error.php on line 10