missing packet sources for openplotter

[m9tz]

Thanks ...

but when I click on "add sources" a view to an internal terminal opens up with the message:

---
Error getting raspberry model: [Errno 2] No such file or directory: '/sys/firmware/devicetree/base/model'
Error getting signal k settings: [Errno 2] No such file or directory: '/etc/systemd/system/signalk.service'
FAILED: 'VERSION_CODENAME'
---

there is no devicetree in /sys/firmware !
and no signalk with 'systemctl list-unit-files | grep signalk'

-- Michael