Found this post as zwave was busted after an upgrade to 0.45. Was super worried I’d have to go through a re flash and a re-inclusion of all devices. Luckily when checking the USB path, it had changed, and a simple update to that line of the config file fixed it.
I fixed my z wave problem with HA 0.45:
$ sudo su -s /bin/bash homeassistant
$ source /srv/homeassistant/bin/activate
$ pip install python_openzwave==0.4.0.31
but your problem looks different
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I had the same error, though not upgrading from 0.45 (had a somehow fresh install in 0.47).
This trick worked for me and solved my problem ! Thanks a lot.