# After a failed attempt on adding a plugin, I reverted to my backup. Tried relaunching. But getting this error. Please give me some solution

**URL:** <https://meta.discourse.org/t/after-a-failed-attempt-on-adding-a-plugin-i-reverted-to-my-backup-tried-relaunching-but-getting-this-error-please-give-me-some-solution/351049>\
**Category:** Support\
**Created:** [February 7, 2025, 11:09am UTC](https://meta.discourse.org/t/after-a-failed-attempt-on-adding-a-plugin-i-reverted-to-my-backup-tried-relaunching-but-getting-this-error-please-give-me-some-solution/351049 "2025-02-07T11:09:02Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![Ajay26](https://avatars.discourse-cdn.com/v4/letter/a/94ad74/32.png) [@Ajay26](https://meta.discourse.org/u/Ajay26)\
**Post date:** [February 10, 2025, 7:36am UTC](https://meta.discourse.org/t/after-a-failed-attempt-on-adding-a-plugin-i-reverted-to-my-backup-tried-relaunching-but-getting-this-error-please-give-me-some-solution/351049/4 "2025-02-10T07:36:38Z")

</div>

Sorry for the confusion. I’m new to it. We have self-hosted a site with the discourse codebase.  
Error (if it helps):

```plaintext

I, [2025-02-10T05:18:31.699440 #1] INFO -- : > cd /var/www/discourse && su discourse -c 'yarn install --frozen-lockfile && yarn cache clean'
error discourse@: The engine "yarn" is incompatible with this module. Expected version "please-use-pnpm". Got "1.22.22"
warning discourse@: The engine "pnpm" appears to be invalid.
error Found incompatible module.
I, [2025-02-10T05:18:31.982174 #1] INFO -- : yarn install v1.22.22
info No lockfile found.

```

Docker version: 26.1.3

OS:  
NAME=“Rocky Linux”  
VERSION=“8.10 (Green Obsidian)”

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