# Why Am I Seeing an Error about "SWC" When I Run \`embeddable:dev\`?

**URL:** <https://community.embeddable.com/t/why-am-i-seeing-an-error-about-swc-when-i-run-embeddable-dev/148>\
**Category:** FAQs\
**Created:** [September 17, 2025, 1:49pm UTC](https://community.embeddable.com/t/why-am-i-seeing-an-error-about-swc-when-i-run-embeddable-dev/148 "2025-09-17T13:49:34Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Chris-Embeddable](https://dub1.discourse-cdn.com/flex013/user_avatar/community.embeddable.com/chris-embeddable/32/24_2.png) [@Chris-Embeddable](https://community.embeddable.com/u/Chris-Embeddable)\
**Post date:** [September 17, 2025, 1:49pm UTC](https://community.embeddable.com/t/why-am-i-seeing-an-error-about-swc-when-i-run-embeddable-dev/148/1 "2025-09-17T13:49:34Z")

</div>

SWC is a piece of technology used by Embeddable’s core SDK. When the node module for it is installed, it’s supposed to build a binary file, but this file doesn’t always get built reliably. If you run into the error, these steps should trigger a full rebuild:

1. Delete the `node_modules` folder
2. Delete `package-lock.json`
3. Re-run `npm install`

If you’re on Windows, you may need to make sure you have Microsoft Visual C++ Redistributable installed first: [Latest supported Visual C++ Redistributable downloads | Microsoft Learn](https://docs.microsoft.com/en-us/cpp/windows/latest-supported-vc-redist)

This should get you up and running!