# Error when building: "Runtime Error: discourse does not support compiling scss/sass files via sprockets"
**URL:** https://meta.discourse.org/t/error-when-building-runtime-error-discourse-does-not-support-compiling-scss-sass-files-via-sprockets/308878
**Category:** Self-hosting
**Created:** [May 21, 2024, 2:11pm UTC](https://meta.discourse.org/t/error-when-building-runtime-error-discourse-does-not-support-compiling-scss-sass-files-via-sprockets/308878 "2024-05-21T14:11:58Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@hedBoy](https://meta.discourse.org/u/hedBoy)
#### Post date: [May 21, 2024, 2:11pm UTC](https://meta.discourse.org/t/error-when-building-runtime-error-discourse-does-not-support-compiling-scss-sass-files-via-sprockets/308878/1 "2024-05-21T14:11:58Z")
found out this error when I opened my web preparing to initiate the site. I didn’t know how to fix it, any one can help me pls
---
### Author:  [@rudzainy](https://meta.discourse.org/u/rudzainy)
#### Post date: [October 5, 2024, 4:02pm UTC](https://meta.discourse.org/t/error-when-building-runtime-error-discourse-does-not-support-compiling-scss-sass-files-via-sprockets/308878/2 "2024-10-05T16:02:15Z")
To anyone encountering this (also note to my future self):
Wait for build to complete and run `localhost:4200` instead of `localhost:3000` 😬 ✨
> [@Install Discourse on macOS for development](https://meta.discourse.org/t/install-discourse-on-macos-for-development/15772/1):
>
> 🎉 You should now be able to navigate to [http://localhost:4200](http://localhost:4200) to see your local Discourse installation. (Note that the first load can take up to a minute as the server is warmed up.)
Build successful message:
```plaintext
Build successful (45326ms) – Serving on http://localhost:4200/
Slowest Nodes (totalTime >= 5%) | Total (avg)
-+-
@embroider/webpack (1) | 22005ms
Babel: discourse-plugins (21) | 8820ms (420 ms)
Funnel (552) | 3371ms (6 ms)
@embroider/compat/app (1) | 2564ms
```