# slicer.util.MRMLNodeNotFoundException Error

**URL:** <https://discourse.slicer.org/t/slicer-util-mrmlnodenotfoundexception-error/39532>\
**Category:** Development\
**Created:** [October 3, 2024, 9:28pm UTC](https://discourse.slicer.org/t/slicer-util-mrmlnodenotfoundexception-error/39532 "2024-10-03T21:28:06Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![BenAsh](https://avatars.discourse-cdn.com/v4/letter/b/b5e925/32.png) [@BenAsh](https://discourse.slicer.org/u/BenAsh)\
**Post date:** [October 3, 2024, 9:28pm UTC](https://discourse.slicer.org/t/slicer-util-mrmlnodenotfoundexception-error/39532/1 "2024-10-03T21:28:06Z")

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Hi there. So I’ve been trying to run a one of the simple filters on my scans, that one being the “RichardsonLucyDeconvolutionImageFilter”. However, whenever I attempt to run this (or any other Simple Filter) I am hit with an error saying ‘slicer.util.MRMLNodeNotFoundException’. I found a previous post regarding this error ([slicer.util.MRMLNodeNotFoundException: could not find nodes in the scene by name or id '' error](https://discourse.slicer.org/t/slicer-util-mrmlnodenotfoundexception-could-not-find-nodes-in-the-scene-by-name-or-id-error/14135)) and attempted to follow the instructions for a fix but, given my limited understanding of coding in general, I’m not sure if it didn’t work because I did it wrong or because the fix is now outdated. Does anyone know what is causing this error and how to fix it? Thanks!

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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:** [October 3, 2024, 9:34pm UTC](https://discourse.slicer.org/t/slicer-util-mrmlnodenotfoundexception-error/39532/2 "2024-10-03T21:34:03Z")

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The error is because you used a node name in the `getNode` thay does not exist. You can see what nodes are available in `Data` module.

If all you want to do is trying ITK image processing filters, such as `RichardsonLucyDeconvolutionImageFilter`, thrn you don’t need any Pyrhon scripting, but you can use the graphical user interface in `Simple Filters` module.