# Error with vmtk extension

**URL:** <https://discourse.slicer.org/t/error-with-vmtk-extension/34750>\
**Category:** Support\
**Created:** [March 6, 2024, 8:10pm UTC](https://discourse.slicer.org/t/error-with-vmtk-extension/34750 "2024-03-06T20:10:01Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Paula\_Feldman](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/paula_feldman/32/69587_2.png) [@Paula\_Feldman](https://discourse.slicer.org/u/Paula_Feldman)\
**Post date:** [March 6, 2024, 8:10pm UTC](https://discourse.slicer.org/t/error-with-vmtk-extension/34750/1 "2024-03-06T20:10:01Z")

</div>

the following shows up in the python interactor and I cannot use the extension from there, only through the GUI. I´m using the latest stable release

Failed to load vtkSlicerCrossSectionAnalysisModuleLogicPython: No module named vtkSlicerShapeModuleMRMLPython  
Failed to load vtkSlicerStenosisMeasurement3DModuleLogicPython: No module named vtkSlicerShapeModuleMRMLPython  
[Qt] Error(s):  
[Qt] CLI executable: C:/Users/User/AppData/Local/slicer.org/Slicer 5.6.1/slicer.org/Extensions-32438/SlicerVMTK/lib/Slicer-5.6/qt-loadable-modules/vtkvmtk.py  
[Qt] The process failed to start. Either the invoked program is missing, or you may have insufficient permissions to invoke the program.  
[Qt] Fail to instantiate module “vtkvmtk”  
[Qt] The following modules failed to be instantiated:  
[Qt] vtkvmtk

---

<div class="post-metadata">

**Author:** ![chir.set](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/chir.set/32/66982_2.png) [@chir.set](https://discourse.slicer.org/u/chir.set)\
**Post date:** [March 6, 2024, 10:26pm UTC](https://discourse.slicer.org/t/error-with-vmtk-extension/34750/2 "2024-03-06T22:26:36Z")

</div>

> [@Paula\_Feldman](#):
>
> [Qt] Fail to instantiate module “vtkvmtk”

This will persist in any Slicer version for now. It is harmless, don’t look at it.

> [@Paula\_Feldman](#):
>
> Failed to load … …

This has been [fixed](https://github.com/Slicer/Slicer/commit/9c875033632aea198791c0960310c165cad487c4). These messages do not appear in the Slicer Preview download. They are are harmless too.