# LungCTSegmenter error:Failed to start segmentation

**URL:** <https://discourse.slicer.org/t/lungctsegmenter-error-failed-to-start-segmentation/24257>\
**Category:** Support\
**Tags:** segmentation\
**Created:** [July 10, 2022, 12:20pm UTC](https://discourse.slicer.org/t/lungctsegmenter-error-failed-to-start-segmentation/24257 "2022-07-10T12:20:13Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Faraday\_Caraway](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/faraday_caraway/32/15934_2.png) [@Faraday\_Caraway](https://discourse.slicer.org/u/Faraday_Caraway)\
**Post date:** [July 10, 2022, 12:20pm UTC](https://discourse.slicer.org/t/lungctsegmenter-error-failed-to-start-segmentation/24257/1 "2022-07-10T12:20:13Z")

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Hello, I am a novice user of 3D Slicer and trying to use version 5.1.0 of the software in windows 11.For a CT that I am looking at, I could not get segmentation done.

 ![2](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/2/c/2cdb21298e857d5800e8dab4fd047c71c937e6ba.jpeg)

It shows error message:Failed to start segmentation: ‘vtkSlicerSegmentationsModuleMRML.vtkMRMLSegmentEdi’ object has no attribute ‘SetMasterVolumeIntensityMask’.When I click the OK button on the message,I can place the control points successfully but nothing happens.What may be the reason?

 ![1657415898799](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/b/f/bf04a66b2ef28c04132967b720f0e755473322ee.jpeg)

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**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:** [July 10, 2022, 12:21pm UTC](https://discourse.slicer.org/t/lungctsegmenter-error-failed-to-start-segmentation/24257/2 "2022-07-10T12:21:30Z")

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There was a regression in Slicer-5.1 Preview Releases for a few days that have been fixed. Please use the latest Slicer Stable Release or the latest Slicer Preview Release.

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**Author:** ![Faraday\_Caraway](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/faraday_caraway/32/15934_2.png) [@Faraday\_Caraway](https://discourse.slicer.org/u/Faraday_Caraway)\
**Post date:** [July 10, 2022, 4:11pm UTC](https://discourse.slicer.org/t/lungctsegmenter-error-failed-to-start-segmentation/24257/3 "2022-07-10T16:11:23Z")

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Thank you! But when I use the latest Slicer Preview Release(slicer-5.1-7-8),I can’t find the "LungCTSegmenter " button in the "chest imaging platform(CIP) "as the slicer-5.1-7-6. What should I do to solve this problem.

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**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:** [July 10, 2022, 4:27pm UTC](https://discourse.slicer.org/t/lungctsegmenter-error-failed-to-start-segmentation/24257/4 "2022-07-10T16:27:20Z")

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Have you installed the LungCTAnalyzer extension?

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**Author:** ![Faraday\_Caraway](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/faraday_caraway/32/15934_2.png) [@Faraday\_Caraway](https://discourse.slicer.org/u/Faraday_Caraway)\
**Post date:** [July 13, 2022, 3:10am UTC](https://discourse.slicer.org/t/lungctsegmenter-error-failed-to-start-segmentation/24257/5 "2022-07-13T03:10:14Z")

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THANK YOU SO MUCH!!! I have successed to use the LungCTSegmenter! Sorry to not reply immediately.