I’m getting the same thing and many of my devices are not showing up in HA and that (the Amcrest error) is the only error I have.
Many of my devices are showing an ‘unknown’ state or show up with an entity ID like zwave._10, zwave._11, etc. I have restarted HA and rebooted the host machine too.
Can anyone check their zwcfg_* file? In trying to figure out what was going on, I noticed that config file is smaller than it should be. When I restart HA I get the things mentioned in my last post here but am also seeing some nodes being identified as ‘Dead’.
Thankfully I have some dated backups that I can pull the zwcfg file from.
Im still getting the Amcrest error though: 2017-07-18 09:10:31 ERROR (Recorder) [homeassistant.components.recorder.util] Error executing query: <GarageCAM: AMC001CX70XPK1MM4S> is not JSON serializable
I guess I am going to have to drop back and punt to the last version of HA. My automation’s are not working with 0.49. Not sure if it is related to the Amcrest error or not.