Error when trying to add trigger/action/condition to rule through UI

  • Platform information:
    • Hardware: Raspberry Pi 4 4GB
    • OS: Buster
    • Java Runtime Environment: no idea
    • openHAB version:3.0.0
      Installed with IOTstack and then updated to version 3.0.0 by changing the docker compose file.

I’m new to openHAB.
I’m trying to create rules through the UI Design Tool. But i always get an error when I try to add any trigger/action or condition.
I can create and save the rule itself, and it will create a config file.

And for some reason i can’t “Create Equipment from Thing” anymore.
If i click it and then click on a thing in the list it just closes the menu and nothing happens.
I have added some locations already with things so I have no clue why it doesn’t work anymore.

There is nothing related to rules in the openhab.log.