Specifying domain gives error of ' Unable to set "domain" to "OrderedDict([(2, Material )])" since each item must be of type "Material"

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