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Fatal error: Uncaught Error: Call to undefined method yii\mail\BaseMailer::className() in /var/www/html/vendor/yiisoft/yii2-debug/panels/MailPanel.php:45 Stack trace: #0 /var/www/html/vendor/yiisoft/yii2/base/BaseObject.php(99): yii\debug\panels\MailPanel->init() #1 [internal function]: yii\base\BaseObject->__construct() #2 /var/www/html/vendor/yiisoft/yii2/di/Container.php(391): ReflectionClass->newInstanceArgs() #3 /var/www/html/vendor/yiisoft/yii2/di/Container.php(157): yii\di\Container->build() #4 /var/www/html/vendor/yiisoft/yii2/BaseYii.php(311): yii\di\Container->get() #5 /var/www/html/vendor/yiisoft/yii2-debug/Module.php(132): yii\BaseYii::createObject() #6 /var/www/html/vendor/yiisoft/yii2-debug/Module.php(105): yii\debug\Module->initPanels() #7 /var/www/html/vendor/yiisoft/yii2/base/BaseObject.php(99): yii\debug\Module->init() #8 /var/www/html/vendor/yiisoft/yii2/base/Module.php(158): yii\base\BaseObject->__construct() #9 [internal function]: yii\base\Module->__construct() #10 /var/www/html/vendor/yiisoft/yii2/di/Container.php(383): ReflectionClass->newInstanceArgs() #11 /var/www/html/vendor/yiisoft/yii2/di/Container.php(157): yii\di\Container->build() #12 /var/www/html/vendor/yiisoft/yii2/BaseYii.php(311): yii\di\Container->get() #13 /var/www/html/vendor/yiisoft/yii2/base/Module.php(427): yii\BaseYii::createObject() #14 /var/www/html/vendor/yiisoft/yii2/base/Application.php(323): yii\base\Module->getModule() #15 /var/www/html/vendor/yiisoft/yii2/web/Application.php(69): yii\base\Application->bootstrap() #16 /var/www/html/vendor/yiisoft/yii2/base/Application.php(281): yii\web\Application->bootstrap() #17 /var/www/html/vendor/yiisoft/yii2/base/BaseObject.php(99): yii\base\Application->init() #18 /var/www/html/vendor/yiisoft/yii2/base/Application.php(207): yii\base\BaseObject->__construct() #19 /var/www/html/index.php(29): yii\base\Application->__construct() #20 {main} thrown in /var/www/html/vendor/yiisoft/yii2-debug/panels/MailPanel.php on line 45