I’m trying to generate multi group cross section for my slab model but getting this error. I’m trying to follow the tutorial ‘MGXS Part IV: Multi-Group Mode Cross-Section Library — OpenMC Documentation’
The link you provided is for version 0.8 which is quite old now.
I guess you are running a newer version of openmc.
For the newer versions the examples have moved here
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thank you very much. i got what i wanted. for clarity, the exact file shimwell is refering to https://github.com/openmc-dev/openmc-notebooks/blob/main/mgxs-part-iii.ipynb