Argument 1 passed to Swift_Mime_SimpleMessage::__construct() must be an instance of Swift_Mime_HeaderSet, none given about symfony

[fabpot]

As stated in the documentation, you must first get the mailer, then create a message.

[umpirsky]

OK, thanks.

But why fatal error? And this strange messaage?

[lsmith77]

See also swiftmailer/swiftmailer#2

[stof]

@umpersly This is because of the design of Swiftmailer. The initialization file has to be included before being able to use any classes of the library and SwiftmailerBundle includes it the first time you get the mailer service.

[umpirsky]

Thanks for the answers ;)

[rochapablo]

I don't get it!

$message = Swift_Message::newInstance(');
$message->setSubject('My subject');

Catchable fatal error: Argument 1 passed to Swift_Mime_SimpleMessage::__construct() must be an instance of Swift_Mime_HeaderSet

How to fix?

[alexandresalome]

@rochapablo You must first call $this->get('mailer') : It's a swiftmailer limitation.

[stof]

@alexandresalome this limitation has been removed years ago thanks to the special autoloader registered by Swiftmailer (you should indeed avoid loading Swiftmailer classes with your own autoloader, but in composer-based projects, Swiftmailer handles it already)

[rochapablo]

I'm sorry, but I'm not understand yet, where came from the $this?

Because, where I'm calling the bellow code in my ClassController, and there's no get('mailer'). So it will not work.

$message = Swift_Message::newInstance();
$message->setSubject('My subject');