# Latest slicer preview (r33816) does not launch in macos

**URL:** https://discourse.slicer.org/t/latest-slicer-preview-r33816-does-not-launch-in-macos/43935
**Category:** Support
**Created:** [August 3, 2025, 5:13am UTC](https://discourse.slicer.org/t/latest-slicer-preview-r33816-does-not-launch-in-macos/43935 "2025-08-03T05:13:58Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![jamesobutler](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jamesobutler/32/7511_2.png) [@jamesobutler](https://discourse.slicer.org/u/jamesobutler)
#### Post date: [August 3, 2025, 11:21am UTC](https://discourse.slicer.org/t/latest-slicer-preview-r33816-does-not-launch-in-macos/43935/2 "2025-08-03T11:21:54Z")

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The same `ModuleNotFoundError: No module named 'encodings'` happens with Slicer 5.8.1 as you reported over in the other thread?

> [@Designer failing to launch on MacOS](https://discourse.slicer.org/t/designer-failing-to-launch-on-macos/43847/2):
>
> Some error pops up with 5.8.1 as well.

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