# Yarn error when building development environment

**URL:** <https://forums.rocket.chat/t/yarn-error-when-building-development-environment/19128>\
**Category:** Community Support\
**Tags:** rocketchat-apps\
**Created:** [January 8, 2024, 12:21am UTC](https://forums.rocket.chat/t/yarn-error-when-building-development-environment/19128 "2024-01-08T00:21:19Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![brewert](https://avatars.discourse-cdn.com/v4/letter/b/e99b99/32.png) [@brewert](https://forums.rocket.chat/u/brewert)\
**Post date:** [January 8, 2024, 12:21am UTC](https://forums.rocket.chat/t/yarn-error-when-building-development-environment/19128/1 "2024-01-08T00:21:19Z")

</div>

### Description

I am using WSL for windows. Ubuntu 20.04. Followed all the steps linked below. But I get a boatload of yarn errors despite having the correct node version. And when I run the app it errors out saying “Your app is crashing”

### Server Setup Information

- Version of Rocket.Chat Server:
- Operating System: Windows
- Deployment Method: [Windows 10 - Rocket.Chat Developer](https://developer.rocket.chat/open-source-projects/server/server-environment-setup/windows-10)
- Number of Running Instances: 1
- NodeJS Version: v14.21.3

### Any additional Information

[Yarn Errors - Pastebin.com](https://pastebin.com/hTKzVuCe)

---

<div class="post-metadata">

**Author:** ![brewert](https://avatars.discourse-cdn.com/v4/letter/b/e99b99/32.png) [@brewert](https://forums.rocket.chat/u/brewert)\
**Post date:** [January 8, 2024, 1:37am UTC](https://forums.rocket.chat/t/yarn-error-when-building-development-environment/19128/3 "2024-01-08T01:37:43Z")

</div>

Fixed, Needed two additional ubuntu libraries.

```auto
sudo apt-get install build-essential

sudo apt-get install libv8-dev

```

then I deleted the node\_modules folder then ran

```auto
yarn

yarn build

yarn dsv

```