# Uncaught (in promise) ReferenceError: THREE is not defined

**URL:** <https://forum.8thwall.com/t/uncaught-in-promise-referenceerror-three-is-not-defined/5983>\
**Category:** Technical Support\
**Created:** [April 9, 2025, 5:01pm UTC](https://forum.8thwall.com/t/uncaught-in-promise-referenceerror-three-is-not-defined/5983 "2025-04-09T17:01:51Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Nathan\_Kroll](https://avatars.discourse-cdn.com/v4/letter/n/ac91a4/32.png) [@Nathan\_Kroll](https://forum.8thwall.com/u/Nathan_Kroll)\
**Post date:** [April 9, 2025, 5:01pm UTC](https://forum.8thwall.com/t/uncaught-in-promise-referenceerror-three-is-not-defined/5983/1 "2025-04-09T17:01:51Z")

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Seems that every 8th Wall project we have currently live and running (as well as all projects we are currently developing) are throwing an error in xr-simd-27.4.4.427.js. This has started happening as of about 30 minutes ago. Was there an update on your end that would cause this?

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**Author:** ![GeorgeButler](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.8thwall.com/georgebutler/32/1903_2.png) [@GeorgeButler](https://forum.8thwall.com/u/GeorgeButler)\
**Post date:** [April 9, 2025, 5:17pm UTC](https://forum.8thwall.com/t/uncaught-in-promise-referenceerror-three-is-not-defined/5983/2 "2025-04-09T17:17:05Z")

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Hi, welcome to the forums!

Can you land your changes and [share the project](https://www.8thwall.com/docs/guides/projects/project-sharing/#share-project-with-another-workspace) with the `support` workspace so I can take a look?

EDIT: Looks like this is a self-hosted project and the error is a result of a bug in the latest engine release. The team has rolled back the engine version and you shouldn’t be seeing any further issues.