# Help me decipher an error message

**URL:** <https://forum.mautic.org/t/help-me-decipher-an-error-message/7081>\
**Category:** General Discussion\
**Created:** [January 8, 2017, 3:07am UTC](https://forum.mautic.org/t/help-me-decipher-an-error-message/7081 "2017-01-08T03:07:41Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![imautic](https://avatars.discourse-cdn.com/v4/letter/i/74df32/32.png) [@imautic](https://forum.mautic.org/u/imautic)\
**Post date:** [January 8, 2017, 3:07am UTC](https://forum.mautic.org/t/help-me-decipher-an-error-message/7081/1 "2017-01-08T03:07:41Z")

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No matter how hard I try, I can’t get the scheduled mail to send. In my system log, I found many lines of the same error message again and again.  
  
Could someone help me make sense of this? Thanks!  
  
  
  
mautic.CRITICAL: Uncaught PHP Exception SymfonyComponentDependencyInjectionExceptionServiceNotFoundException: “You have requested a non-existent service “swiftmailer.mailer.transport.smtp”.” at /home/…/public\_html/…/mautic/vendor/symfony/dependency-injection/Container.php line 305 {“exception”:"[object] (Symfony\Component\DependencyInjection\Exception\ServiceNotFoundException(code: 0): You have requested a non-existent service “swiftmailer.mailer.transport.smtp”. at /home/…/public\_html/…/mautic/vendor/symfony/dependency-injection/Container.php:305)"}

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<div class="post-metadata">

**Author:** ![imautic](https://avatars.discourse-cdn.com/v4/letter/i/74df32/32.png) [@imautic](https://forum.mautic.org/u/imautic)\
**Post date:** [January 8, 2017, 3:07am UTC](https://forum.mautic.org/t/help-me-decipher-an-error-message/7081/2 "2017-01-08T03:07:41Z")

</div>

No matter how hard I try, I can’t get the scheduled mail to send. In my system log, I found many lines of the same error message again and again.  
Could someone help me make sense of this? Thanks!

mautic.CRITICAL: Uncaught PHP Exception SymfonyComponentDependencyInjectionExceptionServiceNotFoundException: “You have requested a non-existent service “swiftmailer.mailer.transport.smtp”.” at /home/…/public\_html/…/mautic/vendor/symfony/dependency-injection/Container.php line 305 {“exception”:"[object] (Symfony\Component\DependencyInjection\Exception\ServiceNotFoundException(code: 0): You have requested a non-existent service “swiftmailer.mailer.transport.smtp”. at /home/…/public\_html/…/mautic/vendor/symfony/dependency-injection/Container.php:305)"}