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Hello ,
Thank you for posting in the community and sorry to hear about this issue. I am not sure what Revit version you are using and what Datasmith version but please check this article here to make sure you are using the right Datasmith plugin:
https://twinmotionhelp.epicgames.com/s/article/Datasmith-Exporter-plugin-5-1-compatibility-with-Twinmotion
Could you provide more details if it working before and stopped working or was this the first time you were trying to get the plugin working?
Here is a link to common troubleshooting articles that could help:
https://twinmotionhelp.epicgames.com/s/article/Datasmith-Exporter-Plugin-Installer-Common-Errors
https://twinmotionhelp.epicgames.com/s/article/Datasmith-Exporter-Plugin-Installation-File-Paths-and-Accessing-Logs-for-Revit
https://twinmotionhelp.epicgames.com/s/article/Datasmith-Exporter-Plugin-Installer-Prerequisite-on-Windows-OS
If you are still having issues please contact us directly by reporting a bug so we can best investigate:
https://twinmotionhelp.epicgames.com/s/case-community-page
Kind regards,
Vincent B.