Failed to fetch adapter Interface for hci0

I installed cybele to a rpi 3b+ with inbuilt bt and added an eq3 thermostat to it. On start i get this:

Connected to MQTT Broker
{
  dongleConfig: {
    hciDevice: 'hci0',
    mode: 'le',
    services: [],
    devices: [ [Object] ]
  },
  error: {
    message: 'Failed to fetch adapter Interface for hci0',
    error: [
      'Rejected send message, 2 matched rules; type="method_call", sender=":1.19" (uid=1000 pid=1637 comm="node cybele/app.js ") interface="org.freedesktop.DBus.Introspectable" member="Introspect" error name="(unset)" requested_reply="0" destination="org.bluez" (uid=0 pid=575 comm="/usr/lib/bluetooth/bluetoothd ")'
    ]
  }
}

I can not find anything about this error in web search. Can someone help me with this?

Using https://github.com/Heckie75/eQ-3-radiator-thermostat/blob/master/eq3.exp i can see information about my thermostat state, so i think the bluetooth connection is working.

Hypfer / Cybele

Failed to fetch adapter Interface for hci0 #22