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Caused by:
Notice: Undefined variable: handler in /var/www/html/vendor/yiisoft/yii2/views/errorHandler/previousException.php on line 9

Fatal error: Uncaught Error: Call to a member function getExceptionName() on null in /var/www/html/vendor/yiisoft/yii2/views/errorHandler/previousException.php:9 Stack trace: #0 {main} thrown in /var/www/html/vendor/yiisoft/yii2/views/errorHandler/previousException.php on line 9