# Editing saved segmentations

**URL:** <https://discourse.slicer.org/t/editing-saved-segmentations/18179>\
**Category:** Support\
**Created:** [June 17, 2021, 6:50am UTC](https://discourse.slicer.org/t/editing-saved-segmentations/18179 "2021-06-17T06:50:44Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![jimbo](https://avatars.discourse-cdn.com/v4/letter/j/d78d45/32.png) [@jimbo](https://discourse.slicer.org/u/jimbo)\
**Post date:** [June 17, 2021, 6:50am UTC](https://discourse.slicer.org/t/editing-saved-segmentations/18179/1 "2021-06-17T06:50:44Z")

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When opening a saved segmentation scene and trying to edit it with the segment editor, the error message: “AttributeError: ‘NoneType’ object has no attribute 'GetNumberOfValues” appears.  
Has anyone else experienced this error and knows how to deal with it?

Thanks!

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<div class="post-metadata">

**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [June 17, 2021, 1:33pm UTC](https://discourse.slicer.org/t/editing-saved-segmentations/18179/2 "2021-06-17T13:33:08Z")

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Could you post the complete application log here?

What Slicer version did you use to create the scene and what Slicer version do open it with now?