A keyerror of openmc.config

I am a beginner of openmc. There is an error occured when I tried to run a demonstration notebook. I can’t figure it out. Could anyone tell me how to solve this problem? Thank you in advance!

Hello @mechaos,

I think OpenMC doesn’t know where your nuclear data library is. So, just tell OpenMC where is it (openmc.config[‘cross_sections’] = “/path/to/cross_sections.xml”)

Best,

Hasan

dear Hasan
thank you for your advice, that works!