# 'vtkSlicerMarkupsModuleMRML.vtkMRMLMarkupsROINode' has no len()

**URL:** <https://discourse.slicer.org/t/vtkslicermarkupsmodulemrml-vtkmrmlmarkupsroinode-has-no-len/19903>\
**Category:** Development\
**Tags:** python\
**Created:** [September 29, 2021, 12:02am UTC](https://discourse.slicer.org/t/vtkslicermarkupsmodulemrml-vtkmrmlmarkupsroinode-has-no-len/19903 "2021-09-29T00:02:58Z")\
**Posts on this page:** 1\
**Showing post:** 6

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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:** [September 29, 2021, 6:53pm UTC](https://discourse.slicer.org/t/vtkslicermarkupsmodulemrml-vtkmrmlmarkupsroinode-has-no-len/19903/6 "2021-09-29T18:53:35Z")

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> [@chir.set](#):
>
> As to why Python breaks with special characters in scripts while Slicer libs are compiled with UTF-8 support, I can’t tell.

It was a problem specific to how macOS loads files by default. I’ve fixed the issue now (see [Couldn't Reload, what's wrong - #4 by lassoan](https://discourse.slicer.org/t/couldnt-reload-whats-wrong/19893/4)).

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