During your initial build command, most commonly when running `npm install`, you might run an error similar to the following:

```bash
Error: Node Sass does not yet support your current environment: Linux 64-bit with Unsupported runtime
```

This most likely means, you're running a higher version of node than supported by your environment.

The versions and their supported environments can be found [here](https://github.com/sass/node-sass/releases). 

* But why does it work locally when I run npm install?

You might indeed find that this works locally when you run the same commands - the first thing to check is what language version you're running locally. 

You may need to downgrade your language version within your DeployHQ project, to match the version running locally: 

https://your-domain.deployhq.com/projects/your-project/build_configuration

If you've made changes to the language version, it would be wise to [clear your build cache](https://www.deployhq.com/support/build-pipelines/build-caching#clean-build) before your next deployment.