# Undefined method \`sub!' when visiting \`/admin/upgrade\`

**URL:** <https://meta.discourse.org/t/undefined-method-sub-when-visiting-admin-upgrade/274682>\
**Category:** Self-hosting\
**Created:** [August 10, 2023, 2:17pm UTC](https://meta.discourse.org/t/undefined-method-sub-when-visiting-admin-upgrade/274682 "2023-08-10T14:17:24Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![david](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/david/32/157490_2.png) [@david](https://meta.discourse.org/u/david)\
**Post date:** [August 10, 2023, 2:43pm UTC](https://meta.discourse.org/t/undefined-method-sub-when-visiting-admin-upgrade/274682/2 "2023-08-10T14:43:25Z")

</div>

A manual rebuild should completely fix things, and the `/upgrade` page should become available again.

Are you running a [standard install](https://meta.discourse.org/t/142537?silent=true)? Can you let us know what plugin’s you have installed?

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_[View the full topic](https://meta.discourse.org/t/undefined-method-sub-when-visiting-admin-upgrade/274682)._