# AnglePlanes Extension not working properly

**URL:** <https://discourse.slicer.org/t/angleplanes-extension-not-working-properly/12306>\
**Category:** Support\
**Tags:** extensions-manager\
**Created:** [June 30, 2020, 7:51pm UTC](https://discourse.slicer.org/t/angleplanes-extension-not-working-properly/12306 "2020-06-30T19:51:49Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![dreilar](https://avatars.discourse-cdn.com/v4/letter/d/d9b06d/32.png) [@dreilar](https://discourse.slicer.org/u/dreilar)\
**Post date:** [June 30, 2020, 7:51pm UTC](https://discourse.slicer.org/t/angleplanes-extension-not-working-properly/12306/1 "2020-06-30T19:51:49Z")

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Operating system: windows 10  
Slicer version: version 4.10.2  
Expected behavior: calculate angle between two planes  
Actual behavior:  
As the title says, is not working properly, it doesnt allow to add new plans base on fiducials.

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**Author:** ![dreilar](https://avatars.discourse-cdn.com/v4/letter/d/d9b06d/32.png) [@dreilar](https://discourse.slicer.org/u/dreilar)\
**Post date:** [June 30, 2020, 9:03pm UTC](https://discourse.slicer.org/t/angleplanes-extension-not-working-properly/12306/2 "2020-06-30T21:03:01Z")

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I´ve just tested the extension in Slicer 4.11 and it is working properly