module 'openpnm.models' has no attribute 'collections'

[Flyyyyyyyy22]

I ran the base example, but this error happened. What should I do please?

[jgostick]

I'm guess that you were running a V3 example with V2 installed. You can confirm this by typing op.__version__ at the python prompt. You can now upgrade your openpnm installation to v3, which we have just released.