# Error message white matter analysis tutorial

**URL:** <https://discourse.slicer.org/t/error-message-white-matter-analysis-tutorial/31657>\
**Category:** Support\
**Created:** [September 12, 2023, 3:01pm UTC](https://discourse.slicer.org/t/error-message-white-matter-analysis-tutorial/31657 "2023-09-12T15:01:06Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![mxd](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/mxd/32/16436_2.png) [@mxd](https://discourse.slicer.org/u/mxd)\
**Post date:** [September 12, 2023, 3:01pm UTC](https://discourse.slicer.org/t/error-message-white-matter-analysis-tutorial/31657/1 "2023-09-12T15:01:06Z")

</div>

I am running through the WMA tutorial and get this error message at this step.

(base) MacBook-Pro-4:WMA\_tutorial\_data mariedrottar$ wm\_separate\_clusters\_by\_hemisphere.py ./FiberClustering/TransformedClusters/example-UKF-data/ ./FiberClustering/SeparatedClusters/

Importing whitematteranalysis package.

\<wm\_separate\_clusters\_by\_hemisphere.py\> Starting computation.

=====input directory ======

./FiberClustering/TransformedClusters/example-UKF-data/

=====output directory =====

./FiberClustering/SeparatedClusters/

==========================

\<wm\_separate\_clusters\_by\_hemisphere.py\> Input number of vtk/vtp files: 800

\<wm\_separate\_clusters\_by\_hemisphere.py\> Separating input file: ./FiberClustering/TransformedClusters/example-UKF-data/cluster\_00001.vtp

Error: ./FiberClustering/TransformedClusters/example-UKF-data/cluster\_00001.vtp has no hemisphere location infromation

Any thoughts on what is going wrong here/  
thank you  
Marie