### if you find error like this:
        o> Target class [swift.mailer] does not exist.
        o> Target class [mail.manager] does not exist.
    go to vendor/beyondcode/helo-laravel/src/HeloLaravelServiceProvider.php
    comment this line of code inside function `register`:
        o> $this->createLaravel6Mailer($app)
        o> $this->createLaravel7Mailer($app)
        o> $this->createLaravel9Mailer($app)
    for now we don't know on some device can't solved this problem, so temporally disable it.