# Dwipreproc eddy\_cuda --slspec Unable to open file MultiBandGroups

**URL:** <https://community.mrtrix.org/t/dwipreproc-eddy-cuda-slspec-unable-to-open-file-multibandgroups/1573>\
**Category:** Uncategorized\
**Created:** [April 6, 2018, 6:45pm UTC](https://community.mrtrix.org/t/dwipreproc-eddy-cuda-slspec-unable-to-open-file-multibandgroups/1573 "2018-04-06T18:45:09Z")\
**Posts on this page:** 1\
**Showing post:** 18

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**Author:** ![maxpietsch](https://community.mrtrix.org/user_avatar/community.mrtrix.org/maxpietsch/32/25_2.png) [@maxpietsch](https://community.mrtrix.org/u/maxpietsch)\
**Post date:** [May 18, 2018, 6:16pm UTC](https://community.mrtrix.org/t/dwipreproc-eddy-cuda-slspec-unable-to-open-file-multibandgroups/1573/18 "2018-05-18T18:16:35Z")

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This sounds like an incompatibility problem between eddy and your OS and cuda similar to [here](https://community.mrtrix.org/t/eddy-cuda-on-osx-versions-10-9/627). Does `eddy_cuda` work on any data? You might need to update [cuda](https://www.nvidia.com/object/macosx-cuda-387.178-driver.html).

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_[View the full topic](https://community.mrtrix.org/t/dwipreproc-eddy-cuda-slspec-unable-to-open-file-multibandgroups/1573)._