php - Alias "yii.swiftmailer" is invalid. Make sure it points to an existing directory or file -

i have configure yii2-swiftmailer according documentation when send mail showing error:

alias "yii.swiftmailer" invalid. make sure points existing directory or file.

c:\xampp\htdocs\hotel\protected\controllers\homecontroller.php(250) 246  247     public function actionmail() 248     { 249  250         yii::app()->mailer->compose() 251             ->setto('example@gmail.com') 252             ->setfrom('example2@gmail.com') 253             ->setsubject('invite') 254             ->settextbody('hello!') 255             ->send(); 256  257     } 258 } 

and extension folder... extention\yii2-swiftmailer

and config:

'mailer' => [             'class' => 'yii\swiftmailer\mailer',             'usefiletransport' => false,//set property false send mails real email addresses             //comment following array send mail using php's mail function             'transport' => [                 'class' => 'swift_smtptransport',                 'host' => 'smtp.gmail.com',                 'username' => '',                 'password' => '',                 'port' => '587',                 'encryption' => 'tls',             ],         ], 

that because try use swiftmailer yii2 not version 1. try extension dedicated yii first version http://www.yiiframework.com/extension/swiftmailer/