# Slicer error in getting segmentation when using monai label

**URL:** <https://discourse.slicer.org/t/slicer-error-in-getting-segmentation-when-using-monai-label/35477>\
**Category:** Support\
**Tags:** sitk, monailabel\
**Created:** [April 13, 2024, 3:43pm UTC](https://discourse.slicer.org/t/slicer-error-in-getting-segmentation-when-using-monai-label/35477 "2024-04-13T15:43:20Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![Sheng-xc](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/sheng-xc/32/70038_2.png) [@Sheng-xc](https://discourse.slicer.org/u/Sheng-xc)\
**Post date:** [April 13, 2024, 3:43pm UTC](https://discourse.slicer.org/t/slicer-error-in-getting-segmentation-when-using-monai-label/35477/1 "2024-04-13T15:43:20Z")

</div>

Hi,

I am working with Slicer5.6.2 and MONAILabel on my mac, using port forwarding from a Ubuntu server.  
The connection, server log, and client interface seem pretty good, but a slicer error raises everytime I try to get a result. No matter I use the function autoseg or scribble annotation, the last line in details of the error will always be:  
"ERROR: Unable to determine ImageIO writer for “slicer:…#vtkMRMLLabelMapVolumeNode…”  
The problem persists whether I was running the exemplary app or a custom app.

Server log:

> Blockquote

```auto
[2024-04-13 13:11:30,113] [87952] [MainThread] [INFO] (monailabel.interfaces.utils.transform:77) - POST - Input Keys: ['device', 'model', 'image', 'result_extension', 'result_dtype', 'client_id', 'description', 'image_path', 'image_meta_dict', 'latencies', 'pred']
[2024-04-13 13:11:30,120] [87952] [MainThread] [INFO] (monailabel.interfaces.utils.transform:122) - POST - Transform (EnsureTyped): Time: 0.0008; image: torch.Size([9, 128, 128, 128])(torch.float32); pred: torch.Size([8, 512, 512, 90])(torch.float32)
[2024-04-13 13:11:30,145] [87952] [MainThread] [INFO] (monailabel.interfaces.utils.transform:122) - POST - Transform (Activationsd): Time: 0.0228; image: torch.Size([9, 128, 128, 128])(torch.float32); pred: torch.Size([8, 512, 512, 90])(torch.float32)
[2024-04-13 13:11:30,161] [87952] [MainThread] [INFO] (monailabel.interfaces.utils.transform:122) - POST - Transform (AsDiscreted): Time: 0.0142; image: torch.Size([9, 128, 128, 128])(torch.float32); pred: torch.Size([1, 512, 512, 90])(torch.float32)
[2024-04-13 13:11:30,165] [87952] [MainThread] [INFO] (monailabel.interfaces.utils.transform:122) - POST - Transform (SqueezeDimd): Time: 0.0016; image: torch.Size([9, 128, 128, 128])(torch.float32); pred: torch.Size([512, 512, 90])(torch.float32)
[2024-04-13 13:11:30,594] [87952] [MainThread] [INFO] (monailabel.interfaces.utils.transform:122) - POST - Transform (ToNumpyd): Time: 0.4269; image: torch.Size([9, 128, 128, 128])(torch.float32); pred: (512, 512, 90)(float32)
[2024-04-13 13:11:30,596] [87952] [MainThread] [INFO] (monailabel.interfaces.utils.transform:122) - POST - Transform (Restored): Time: 0.0007; image: torch.Size([9, 128, 128, 128])(torch.float32); pred: (512, 512, 90)(float32)
[2024-04-13 13:11:57,518] [87952] [MainThread] [INFO] (monailabel.interfaces.utils.transform:122) - POST - Transform (GetCentroidsd): Time: 26.9163; image: torch.Size([9, 128, 128, 128])(torch.float32); pred: (512, 512, 90)(float32)
[2024-04-13 13:11:57,522] [87952] [MainThread] [INFO] (monailabel.tasks.infer.basic_infer:604) - Writing Result...
[2024-04-13 13:11:57,532] [87952] [MainThread] [INFO] (monailabel.transform.writer:196) - Result ext: .nrrd; write_to_file: True; dtype: uint8
[2024-04-13 13:11:59,297] [87952] [MainThread] [INFO] (monailabel.tasks.infer.basic_infer:335) - ++ Latencies => Total: 41.1608; Pre: 11.5325; Inferer: 0.3257; Invert: 0.1006; Post: 27.4148; Write: 1.7746
[2024-04-13 13:11:59,299] [87952] [MainThread] [INFO] (monailabel.tasks.infer.basic_infer:370) - Result File: /tmp/tmp6mf0gp4b.nrrd
[2024-04-13 13:11:59,300] [87952] [MainThread] [INFO] (monailabel.tasks.infer.basic_infer:371) - Result Json Keys: ['label_names', 'latencies', 'centroids']

```

Slicer error:  
When using autoseg —— Failed to run inference in MONAI Label Server.  
When using scribble —— Failed to post process label on MONAI Label Sever using Histogram+GraphCut.  
Details of the error using autoseg:

> Blockquote

```auto
Traceback (most recent call last):
  File "/Applications/Slicer.app/Contents/Extensions-32448/MONAILabel/lib/Slicer-5.6/qt-scripted-modules/MONAILabel.py", line 1553, in onClickSegmentation
    self.updateSegmentationMask(result_file, labels)
  File "/Applications/Slicer.app/Contents/Extensions-32448/MONAILabel/lib/Slicer-5.6/qt-scripted-modules/MONAILabel.py", line 1755, in updateSegmentationMask
    labelmapVolumeNode = sitkUtils.PushVolumeToSlicer(labelImage, None, className="vtkMRMLLabelMapVolumeNode")
  File "/Applications/Slicer.app/Contents/bin/Python/sitkUtils.py", line 25, in PushVolumeToSlicer
    sitk.WriteImage(sitkimage, myNodeFullITKAddress)
  File "/Applications/Slicer.app/Contents/lib/Python/lib/python3.9/site-packages/SimpleITK/extra.py", line 425, in WriteImage
    return writer.Execute(image)
  File "/Applications/Slicer.app/Contents/lib/Python/lib/python3.9/site-packages/SimpleITK/SimpleITK.py", line 7907, in Execute
    return _SimpleITK.ImageFileWriter_Execute(self, *args)
RuntimeError: Exception thrown in SimpleITK ImageFileWriter_Execute: /Users/runner/work/1/sitk/Code/IO/src/sitkImageFileWriter.cxx:206:
sitk::ERROR: Unable to determine ImageIO writer for "slicer:0x7fabb9c9c2e0#vtkMRMLLabelMapVolumeNode3"

```

Is there anyway I can fix the problem? Thanks in advance.

---

<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:** [April 13, 2024, 3:44pm UTC](https://discourse.slicer.org/t/slicer-error-in-getting-segmentation-when-using-monai-label/35477/2 "2024-04-13T15:44:18Z")

</div>

It seems that one of the extensions that you installed replaced SimpleITK package that is bundled with Slicer. To restore SimpleITK, you can reinstall Slicer into a new folder and avoid the extension that replaced SimpleITK.

---

<div class="post-metadata">

**Author:** ![Sheng-xc](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/sheng-xc/32/70038_2.png) [@Sheng-xc](https://discourse.slicer.org/u/Sheng-xc)\
**Post date:** [April 14, 2024, 4:29am UTC](https://discourse.slicer.org/t/slicer-error-in-getting-segmentation-when-using-monai-label/35477/3 "2024-04-14T04:29:44Z")

</div>

Thank you for the prompt reply! It worked!

---

<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:** [April 14, 2024, 3:49pm UTC](https://discourse.slicer.org/t/slicer-error-in-getting-segmentation-when-using-monai-label/35477/4 "2024-04-14T15:49:32Z")

</div>

Do you know which extension was the culprit?

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<div class="post-metadata">

**Author:** ![Xiaojie\_Guo](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/xiaojie_guo/32/67098_2.png) [@Xiaojie\_Guo](https://discourse.slicer.org/u/Xiaojie_Guo)\
**Post date:** [October 24, 2025, 2:39am UTC](https://discourse.slicer.org/t/slicer-error-in-getting-segmentation-when-using-monai-label/35477/5 "2025-10-24T02:39:58Z")

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> If the SimpleITK package that is bundled with Slicer has been replaced by some extensions, is it possible to reinstall this specified SimpleITK? Because I have installed many extensions. It seems that this SimpleITK package has sitkUtils.py file and registered Slicer image IO. Can I copy sitkUtils.py to the Slicer folder and register Slicer image IO with some codes?