# After Cache-delete "The site is currently offline due to encountering an error" **URL:** \ **Category:** Product Support\ **Tags:** mautic-3\ **Created:** [April 24, 2021, 10:04am UTC](https://forum.mautic.org/t/after-cache-delete-the-site-is-currently-offline-due-to-encountering-an-error/19159 "2021-04-24T10:04:18Z")\ **Posts on this page:** 1\ **Showing post:** 9
**Author:** ![imihandstand](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/imihandstand/32/1499_2.png) [@imihandstand](https://forum.mautic.org/u/imihandstand)\ **Post date:** [April 29, 2021, 1:09pm UTC](https://forum.mautic.org/t/after-cache-delete-the-site-is-currently-offline-due-to-encountering-an-error/19159/9 "2021-04-29T13:09:09Z")
**SOLVED!** I read at “[_ERR\_BUILD\_M3\_CACHE: Failed to build cache for Mautic 3_](https://forum.mautic.org/t/err-build-m3-cache-failed-to-build-cache-for-mautic-3-all-your-data-has-been-successfully-migrated-to-mautic-3-but-this-error-very-likely-needs-to-be-fixed-before-you-can-start-using-mautic-3/15569)” that somebody had upgrade-problems and I found similar errors in my log today. Than the user @imrodmartin revealed that’s **because of an outdated plugin**. I deleted than the Plugin “ **MauticExtendeeToolsBundle** ” (which generated the errors) and now deleting the cache-folder is not a problem anymore. For future searchers: The error was: `[27-Apr-2021 14:54:22 UTC] ReflectionException: Class "Mautic\CoreBundle\EventListener\CommonSubscriber" not found while loading "MauticPlugin\MauticExtendeeToolsBundle\EventListener\ButtonSubscriber". - in file /mywebsite/mautic/vendor/symfony/config/Resource/ClassExistenceResource.php - at line 181` @ekke Thank you very much for trying to help me! 🙂 --- _[View the full topic](https://forum.mautic.org/t/after-cache-delete-the-site-is-currently-offline-due-to-encountering-an-error/19159)._