# Error in the custom plugin, after upgrade the mautic

**URL:** <https://forum.mautic.org/t/error-in-the-custom-plugin-after-upgrade-the-mautic/32654>\
**Category:** Development\
**Created:** [July 5, 2024, 9:54am UTC](https://forum.mautic.org/t/error-in-the-custom-plugin-after-upgrade-the-mautic/32654 "2024-07-05T09:54:05Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![sujeet.thete](https://avatars.discourse-cdn.com/v4/letter/s/a5b964/32.png) [@sujeet.thete](https://forum.mautic.org/u/sujeet.thete)\
**Post date:** [July 5, 2024, 9:54am UTC](https://forum.mautic.org/t/error-in-the-custom-plugin-after-upgrade-the-mautic/32654/1 "2024-07-05T09:54:05Z")

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Hello,  
I have upgraded the mautic to 5.1, in older version I have developed a custom plugin. But after upgraded the mautic, the custom plugin not working.  
In the custom plugin, I have created external menu, when I clicked on the link I am getting “Inernal Server Error”, I checked the logs and found following error.

mautic.CRITICAL: Uncaught PHP Exception LogicException: ““MauticPlugin\MauticVtigerContactReplicatorBundle\Controller\HomeController” has no container set, did you forget to define it as a service subscriber?” at /var/www/vhosts/new-master-dev.ballistixmail.com/www/vendor/symfony/framework-bundle/Controller/ControllerResolver.php line 37 {“exception”:“[object] (LogicException(code: 0): "MauticPlugin\MauticVtigerContactReplicatorBundle\Controller\HomeController" has no container set, did you forget to define it as a service subscriber? at /var/www/vhosts/new-master-dev.ballistixmail.com/www/vendor/symfony/framework-bundle/Controller/ControllerResolver.php:37)”} {“hostname”:“mautic-dev02”,“pid”:2622589}