I’ve just checked this article but it doesn’t say anything to solve my problem. I executed the init command but it doesn’t work. Moreover there is no such common/config/main-local.php file in the yii2 structure.
'components' => [
'db' => [
'class' => 'yii\db\Connection',
'dsn' => 'mysql:host=localhost;dbname=yii2advanced',
'username' => '',
'password' => '',
'charset' => 'utf8',
'mailer' => [
'class' => 'yii\swiftmailer\Mailer',
'viewPath' => '@common/mail',
// send all mails to a file by default. You have to set
// 'useFileTransport' to false and configure a transport
// for the mailer to send real emails.
'useFileTransport' => true,