# Mautic and Maulgun plugin issue **URL:** \ **Category:** Product Support\ **Created:** [March 12, 2021, 9:32am UTC](https://forum.mautic.org/t/mautic-and-maulgun-plugin-issue/18538 "2021-03-12T09:32:14Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![enricosigurta](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/enricosigurta/32/3676_2.png) [@enricosigurta](https://forum.mautic.org/u/enricosigurta)\ **Post date:** [March 12, 2021, 9:32am UTC](https://forum.mautic.org/t/mautic-and-maulgun-plugin-issue/18538/1 "2021-03-12T09:32:15Z")
**Your software** My Mautic version is: 3.3.1 My PHP version is: 7.4 My Database type and version is: no idea **Your problem** My problem is: Hi, I tried to install the Mailgun integration plugin for mautic. After setting it’s options I get this issue every time I try to enter my backend. What should I do? This is the report from the log. Thank you 🙂 Could not check compatibility between MauticPlugin\AFMailgunBundle\Swiftmailer\Transport\MailgunTransport::send(Swift\_Mime\_Message $message, &$failedRecipients = NULL) and Swift\_Transport\_AbstractSmtpTransport::send(Swift\_Mime\_SimpleMessage $message, &$failedRecipients = NULL), because class Swift\_Mime\_Message is not available in /home/zezaph5/public\_html/omqiway.net/crm/plugins/AFMailgunBundle/Swiftmailer/Transport/MailgunTransport.php on line 64 ---
**Author:** ![enricosigurta](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/enricosigurta/32/3676_2.png) [@enricosigurta](https://forum.mautic.org/u/enricosigurta)\ **Post date:** [March 15, 2021, 4:36pm UTC](https://forum.mautic.org/t/mautic-and-maulgun-plugin-issue/18538/2 "2021-03-15T16:36:44Z")
A little update: the site appears offline and I cannot find a way to put it back online. I tried to delete the Mailgun plugin, but it’s still offline. Any advice on how to put it back online? Thank you 🙂 ---
**Author:** ![EJL](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/ejl/32/12155_2.png) [@EJL](https://forum.mautic.org/u/EJL)\ **Post date:** [March 15, 2021, 5:06pm UTC](https://forum.mautic.org/t/mautic-and-maulgun-plugin-issue/18538/3 "2021-03-15T17:06:34Z")
**/bin/console cache:clear** ---
**Author:** ![enricosigurta](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/enricosigurta/32/3676_2.png) [@enricosigurta](https://forum.mautic.org/u/enricosigurta)\ **Post date:** [March 15, 2021, 6:03pm UTC](https://forum.mautic.org/t/mautic-and-maulgun-plugin-issue/18538/4 "2021-03-15T18:03:19Z")
Thank you @EJL🙂 Unfortuntately it didn’t work. I tried to use the command both with the plugin inside the directory and with the plugin removed. In both cases I got this from the terminal: In FileLoader.php line 168: Not a built-in Swiftmailer transport: mautic.transport.mailgun in . (which is loaded in resource “.”). Make sure there is a loader supporting the “mautic” ty pe. In SwiftmailerTransportFactory.php line 74: Not a built-in Swiftmailer transport: mautic.transport.mailgun. cache:clear [–no-warmup] [–no-optional-warmers] [-h|–help] [-q|–quiet] [-v|vv|vvv|–verbose] [-V|–version] [–ansi] [–no-ansi] [-n|–no-interaction] [-e|–env ENV] [–no-debug] [–] [zezaph5@depro15 ~]$ php /home/zezaph5/public\_html/omqiway.net/crm/bin/console cache:clear [WARNING] Some commands could not be registered: In getMautic\_Transport\_MailgunService.php line 8: Class ‘MauticPlugin\AFMailgunBundle\Swiftmailer\Transport\MailgunTransport’ not found In getMautic\_Transport\_MailgunService.php line 8: Class ‘MauticPlugin\AFMailgunBundle\Swiftmailer\Transport\MailgunTransport’ not found In getMautic\_Transport\_MailgunService.php line 8: Class ‘MauticPlugin\AFMailgunBundle\Swiftmailer\Transport\MailgunTransport’ not found In getMautic\_Transport\_MailgunService.php line 8: Class ‘MauticPlugin\AFMailgunBundle\Swiftmailer\Transport\MailgunTransport’ not found // Clearing the cache for the prod environment with debug false In FileLoader.php line 168: Not a built-in Swiftmailer transport: mautic.transport.mailgun in . (which is loaded in resource “.”). Make sure there is a loader supporting the “mautic” ty pe. In SwiftmailerTransportFactory.php line 74: Not a built-in Swiftmailer transport: mautic.transport.mailgun. cache:clear [–no-warmup] [–no-optional-warmers] [-h|–help] [-q|–quiet] [-v|vv|vvv|–verbose] [-V|–version] [–ansi] [–no-ansi] [-n|–no-interaction] [-e|–env ENV] [–no-debug] [–] What can I do? ---
**Author:** ![EJL](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/ejl/32/12155_2.png) [@EJL](https://forum.mautic.org/u/EJL)\ **Post date:** [March 15, 2021, 6:24pm UTC](https://forum.mautic.org/t/mautic-and-maulgun-plugin-issue/18538/5 "2021-03-15T18:24:01Z")
mautic/app/config/local.php line 15 change ‘mailer\_transport’ =\> **‘smtp’,** then try clearing cache ---
**Author:** ![enricosigurta](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/enricosigurta/32/3676_2.png) [@enricosigurta](https://forum.mautic.org/u/enricosigurta)\ **Post date:** [March 16, 2021, 9:34am UTC](https://forum.mautic.org/t/mautic-and-maulgun-plugin-issue/18538/6 "2021-03-16T09:34:18Z")
Thank you @EJL🙂 I tried with SMTP but it didnt’ work. I tried with mautic.transport.smtp and still didn’t work. However I solved it by using mautic.transport.mailjet. ---
**Author:** ![EJL](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/ejl/32/12155_2.png) [@EJL](https://forum.mautic.org/u/EJL)\ **Post date:** [March 16, 2021, 1:53pm UTC](https://forum.mautic.org/t/mautic-and-maulgun-plugin-issue/18538/7 "2021-03-16T13:53:15Z")
Awesome. Glad it has been solved.