# OpenMC crashing on Mac (\<Signals.SIGILL: 4\>)

**URL:** <https://openmc.discourse.group/t/openmc-crashing-on-mac-signals-sigill-4/494>\
**Category:** User Support\
**Created:** [October 10, 2019, 5:21pm UTC](https://openmc.discourse.group/t/openmc-crashing-on-mac-signals-sigill-4/494 "2019-10-10T17:21:58Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Julian\_Vevik](https://avatars.discourse-cdn.com/v4/letter/j/bcef8e/32.png) [@Julian\_Vevik](https://openmc.discourse.group/u/Julian_Vevik)\
**Post date:** [October 10, 2019, 5:21pm UTC](https://openmc.discourse.group/t/openmc-crashing-on-mac-signals-sigill-4/494/1 "2019-10-10T17:21:58Z")

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Hi!

I am experiencing crashes when running openmc with openmc.run(). It runs through my batches and then crashes with CalledProcessError: Command ‘openmc’ died with \<Signals.SIGILL: 4\>. as seen in the pictures. It creates statepoint-files and geometries etc, but seems to crash just before presenting the summary of the run.

I can’t seem to plot the geometry using openmc.plot\_inline(PLOT) either. This also gives the Signals.SIGILL: 4 error. See picture. The plots are however created in my files and I get good looking .ppm geometry-plots, but they won’t seem to plot inline in my JupyterLab.

Have tried several versions, and reinstalled openmc without any changes. I am currently running version 0.11.0-dev.

Does anyone know what to do? Any help will be greatly appreciated.

Julian Vevik

 ![run_error.png](https://global.discourse-cdn.com/free1/uploads/openmc/original/1X/141aed5c75449b2ae7cf0479454ba8c96a379009.png)

 ![plot_error.png](https://global.discourse-cdn.com/free1/uploads/openmc/original/1X/23d1c2a5793c56cadd7436bc58c0e12380294b0c.png)

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**Author:** ![Sindre\_Kaald](https://avatars.discourse-cdn.com/v4/letter/s/51bf81/32.png) [@Sindre\_Kaald](https://openmc.discourse.group/u/Sindre_Kaald)\
**Post date:** [October 13, 2019, 10:01am UTC](https://openmc.discourse.group/t/openmc-crashing-on-mac-signals-sigill-4/494/2 "2019-10-13T10:01:02Z")

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The function openmc.plot\_inline(PLOT) works only, I think, in a jupyter notebook (or lab) or in QtConsole. Using jupyter lab is extremely convenient so I would give that a go. For the other problem: a new version v0.11.0 (note not dev) with depletion etc. was recently released. Could help make the installation a bit easier as you can install everything through conda. I would try that first! My guess is that it OpenMC is trying to use a python version installed at another location, had a similar issue myself.

Sindre

torsdag 10. oktober 2019 19.21.59 UTC+2 skrev Julian Vevik følgende:

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**Author:** ![Julian\_Vevik](https://avatars.discourse-cdn.com/v4/letter/j/bcef8e/32.png) [@Julian\_Vevik](https://openmc.discourse.group/u/Julian_Vevik)\
**Post date:** [October 14, 2019, 11:11am UTC](https://openmc.discourse.group/t/openmc-crashing-on-mac-signals-sigill-4/494/3 "2019-10-14T11:11:44Z")

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Hi!

Yeah, I am using Jupyter Lab, but I think the plotting error was caused by the same problem as when running openmc.run().

I ended up getting everything working correctly now with version 0.11.0. I had to uninstall and install again using pip, because I think my previous installation was done using pip3 which seems to point to a different folder, so it seems like you were correct in that openmc were trying to use a different python installation. And I also used the cmake -DCMAKE\_INSTALL\_PREFIX=$HOME\*\*/.local …\*\* call when installing this time, but unsure if that really made any difference.

Thank you!

Julian

søndag 13. oktober 2019 12.01.02 UTC+2 skrev Sindre Kaald følgende: