# Cannot delete sequence after specifying segmentation as proxy node

**URL:** <https://discourse.slicer.org/t/cannot-delete-sequence-after-specifying-segmentation-as-proxy-node/7543>\
**Category:** Support\
**Tags:** segmentation, sequences\
**Created:** [July 12, 2019, 12:41am UTC](https://discourse.slicer.org/t/cannot-delete-sequence-after-specifying-segmentation-as-proxy-node/7543 "2019-07-12T00:41:40Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![ungi](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/ungi/32/78573_2.png) [@ungi](https://discourse.slicer.org/u/ungi)\
**Post date:** [July 12, 2019, 12:41am UTC](https://discourse.slicer.org/t/cannot-delete-sequence-after-specifying-segmentation-as-proxy-node/7543/1 "2019-07-12T00:41:40Z")

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Hi,  
I cannot delete sequences, once I add a segmentation as proxy node to a sequence in the same browser. Could somebody please look into this issue?  
I tested this with version 2019-07-04 (BTW, there is no Sequences extension in today’s Extension Manager for Windows). Here is a screen video of the issue: [https://1drv.ms/v/s!AhiABcbe1DBygu57EAFEs6T-O6sdDQ](https://1drv.ms/v/s!AhiABcbe1DBygu57EAFEs6T-O6sdDQ)  
Thanks,  
Tamas

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**Author:** ![jcfr](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jcfr/32/17825_2.png) [@jcfr](https://discourse.slicer.org/u/jcfr)\
**Post date:** [July 12, 2019, 2:26am UTC](https://discourse.slicer.org/t/cannot-delete-sequence-after-specifying-segmentation-as-proxy-node/7543/2 "2019-07-12T02:26:48Z")

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> [@ungi](#):
>
> there is no Sequences extension in today’s Extension Manager for Windows

This will be fixed by

> <https://github.com/SlicerRt/Sequences/pull/80>
>
> This commit fixes a regression introduced in previous commit. It fixes
> the foll…owing error:
> 
> \`\`\`
> vtkMRMLNodeSequencer.obj : error LNK2019: unresolved external symbol "\_\_declspec(dllimport) public: static class vtkMRMLVolumePropertyNode \[...\]
> \`\`\`
> 
> Reported-by: Tamas Ungi \<ungi@queensu.ca\>

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**Author:** ![ungi](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/ungi/32/78573_2.png) [@ungi](https://discourse.slicer.org/u/ungi)\
**Post date:** [July 12, 2019, 9:34pm UTC](https://discourse.slicer.org/t/cannot-delete-sequence-after-specifying-segmentation-as-proxy-node/7543/3 "2019-07-12T21:34:33Z")

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Thanks, Sequences is there for Windows today.

FYI, the original issue may be fixed tomorrow by [https://github.com/Slicer/Slicer/commit/fb0b277eca7af84cceb29aabb9fef521a29fb4c4](https://github.com/Slicer/Slicer/commit/fb0b277eca7af84cceb29aabb9fef521a29fb4c4)  
I will test again tomorrow.

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**Author:** ![ungi](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/ungi/32/78573_2.png) [@ungi](https://discourse.slicer.org/u/ungi)\
**Post date:** [July 13, 2019, 7:03pm UTC](https://discourse.slicer.org/t/cannot-delete-sequence-after-specifying-segmentation-as-proxy-node/7543/4 "2019-07-13T19:03:30Z")

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This problem is still there in today’s version. I think the list widget does not update correctly when a sequence is deleted. But I’m not sure why the problem only occurs after a segmentation is specified as proxy node.