[SOLVED] Device_tracker unable to load / known_devices.yaml not found after HA update

Installation
1

Hi,

After the upgrade of HA to 0.48.1 MySensors sensors information is not updated, only after restarting Home Assistant once, but with an old value (the one before upgrading). I updated netdisco manually as always to the now correct version (1.0.1). Maybe that is the cause? The Philips Hue lamp is detected and working.

ERROR (MainThread) [homeassistant.components.device_tracker] Unable to load 
/home/homeass/.homeassistant/known_devices.yaml: Config file not found:
/home/homeass/.homeassistant/known_devices.yaml

I did not use the device_tracker component yet, if it is related to this problem.

[SOLVED] I (again) mixed up different problems, and my main problem in this case was the radios were not talking to each other correctly.