Error configuring OneWire integration

I’ve installed Hass.io on a Pi3 Raspbian system with this guide, I’ve added the dtoverlay=w1-gpio in boot.txt and I can see devices in /sys/bus/w1/devices/ on the host system, but on hass.io I still get the error:

2019-11-26 16:13:32 ERROR (SyncWorker_7) [homeassistant.components.onewire.sensor] No onewire sensor found. Check if dtoverlay=w1-gpio is in your /boot/config.txt. Check the mount_dir parameter if it's defined

Given that the first condition is satisfied, it’s probably the mount_dir missing. I’ve done searches around but haven’t found how to check/mount this directory. Anyone has more info?

Thanks

I have same issue. I checked all the ways to repair it but no result…

Unfortunately I cannot help… I ended up with HassOS, giving up control on the base OS.