# UKF exit abnormally

**URL:** <https://discourse.slicer.org/t/ukf-exit-abnormally/34734>\
**Category:** Support\
**Created:** [March 6, 2024, 7:40am UTC](https://discourse.slicer.org/t/ukf-exit-abnormally/34734 "2024-03-06T07:40:20Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Pranali](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/pranali/32/69263_2.png) [@Pranali](https://discourse.slicer.org/u/Pranali)\
**Post date:** [March 6, 2024, 7:40am UTC](https://discourse.slicer.org/t/ukf-exit-abnormally/34734/1 "2024-03-06T07:40:20Z")

</div>

Hello, I’m using ubuntu 20.04 , i ran following command with error:  
./Slicer --launch UKFTractography --dwiFile /home/inspire\_lab/Downloads/IXI-DATA-nrrd/combine\_conform\_IXI034-HH-1260.nrrd --maskFile /home/inspire\_lab/Downloads/IXI-DATA-brain\_mask/combine\_conform\_IXI034-HH-1260\_brain\_mask.nrrd --tracts /home/inspire\_lab/Downloads/combine\_conform\_IXI034-HH-1260\_tract.vtk --recordFA --recordTrace  
Using the 2T simple model. Setting the default parameters accordingly:  
“\*”: set by user  
“-”: default setting

- stoppingFA: 0.15

- seedingThreshold: 0.18

- Qm: 0.001
- Ql: 50
- Rs: 0.02

- stepLength: 0.3
- recordLength: 0.9
- stoppingThreshold: 0.1

- seedsPerVoxel: 1  
Found 20 cores on your system.  
Running tractography with 20 thread(s).  
DWMRI\_b-value 1000  
Number of non-zero gradients: 15  
Number of zero gradients: 1  
Permuting the axis order to: 3 0 1 2  
Resizing the data to: 15 256 256 256  
Computing the baseline image  
Dividing the signal by baseline image  
Converting the world coordinate system to RAS  
Data normalization finished!

Using 2-tensor simple model.  
Branching disabled

Using unconstrained filter  
**error: [[slicer.org/Extensions-32438/UKFTractography/lib/Slicer-5.6/cli-modules/./UKFTractography](http://slicer.org/Extensions-32438/UKFTractography/lib/Slicer-5.6/cli-modules/./UKFTractography)] exit abnormally - Report the problem.**  
what exactly is the problem?