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Home/ Questions/Q 7830571
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Editorial Team
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Editorial Team
Asked: June 2, 20262026-06-02T11:17:36+00:00 2026-06-02T11:17:36+00:00

I installed symfony2 and FOSUserBundle. Both are working correctly, however when I access the

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I installed symfony2 and FOSUserBundle. Both are working correctly, however when I access the registration page of FOSUserBundle, which is using SwiftMailer as for email confirmation I get the following error instantly.

Fatal error: Class 'Swift_Mailer' not found in /home/public_html/cache/dev/appDevDebugProjectContainer.php on line 1331

Line 1331 has the following code:

return $this->services['mailer'] = new \Swift_Mailer($this->get('swiftmailer.transport'));

In the debug information, I see SwiftMailerBundle is correctly loaded. Now I’m stuck, I have been struggling with this for quite some time and I’m not familiar with Symfony just yet. Pretty sure it’s my shortcoming, but a pair of fresh eyes will help. Am I missing something, is this something configurable? The Swift\Mailer class is actually on the server, located under vendor/swiftmailer/swiftmailer/lib/classes/swift/mailer.php

anyone can help with this? Thanks a lot!

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  1. Editorial Team
    Editorial Team
    2026-06-02T11:17:44+00:00Added an answer on June 2, 2026 at 11:17 am

    Can you check whether you have these lines in your app\autoload.php:

    // Swiftmailer needs a special autoloader to allow
    // the lazy loading of the init file (which is expensive)
    require_once __DIR__.'/../vendor/swiftmailer/lib/classes/Swift.php';
    Swift::registerAutoload(__DIR__.'/../vendor/swiftmailer/lib/swift_init.php');
    
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