Question #247021 on Yade changed:
https://answers.launchpad.net/yade/+question/247021
Status: Open => Answered
jduriez proposed the following answer:
Hi,
The error says the i.phys you want to access is "NoneType", probably it does
not exist. Did you run at least one iteration (with O.step(), or O.run() ) ?
It is necessary for the interactions to be detected and exist.
Jérôme
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