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Caused by:
Notice: Undefined variable: handler in C:\xampp\htdocs\inlislite3-old\vendorxa\yiisoft\yii2\views\errorHandler\previousException.php on line 9

Fatal error: Call to a member function getExceptionName() on null in C:\xampp\htdocs\inlislite3-old\vendorxa\yiisoft\yii2\views\errorHandler\previousException.php on line 9