# Segmentation fault: 11 when using DWIConvert

**URL:** <https://discourse.slicer.org/t/segmentation-fault-11-when-using-dwiconvert/4015>\
**Category:** Support\
**Created:** [September 7, 2018, 11:30am UTC](https://discourse.slicer.org/t/segmentation-fault-11-when-using-dwiconvert/4015 "2018-09-07T11:30:13Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![alca](https://avatars.discourse-cdn.com/v4/letter/a/7ab992/32.png) [@alca](https://discourse.slicer.org/u/alca)\
**Post date:** [September 7, 2018, 11:30am UTC](https://discourse.slicer.org/t/segmentation-fault-11-when-using-dwiconvert/4015/1 "2018-09-07T11:30:13Z")

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Operating system: Mac Os  
Slicer version: 4.8.1

I am trying to use DWIConvert to convert nrrd to nii (–conversionMode NrrdToFSL) on the data that were previously preprocessed by DTIPrep (before that I successfully converted them from nii to nrrd), but I am receiving the error message “Segmentation fault: 11”. Any idea what went wrong?

Best

Alena

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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 7, 2018, 12:39pm UTC](https://discourse.slicer.org/t/segmentation-fault-11-when-using-dwiconvert/4015/2 "2018-09-07T12:39:15Z")

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A post was merged into an existing topic: [Segmentation fault: 11 with DWIConvert](https://discourse.slicer.org/t/segmentation-fault-11-with-dwiconvert/3989)

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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 7, 2018, 12:39pm UTC](https://discourse.slicer.org/t/segmentation-fault-11-when-using-dwiconvert/4015/3 "2018-09-07T12:39:16Z")

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