ModuleNotFoundError: No module named 'metavision_core'

ModuleNotFoundError: No module named 'metavision_core'

Hello, I have installed metavision  SDK on ubuntu 18.04 successfully, and the Metavision Studio worked well.
Besides, I have set the anaconda environment according to the usage https://docs.prophesee.ai/stable/installation/linux.html.
However, when I try to run a python program from getting started using python https://docs.prophesee.ai/stable/metavision_sdk/get_started/index.html?highlight=getting%20started
it occuered an error ModuleNotFoundError: No module named 'metavision_core', and I used python 3.6,
I guess that it would be the problem of environment varibles, but it seems that the environment varibles have been set automaticlly, so what should I do to solve it?
Hope for your reply.