Install OH3 successful but WebUi not reachable

[Koensk (Koen Quicken)]

When I check the status it’s tells me OH is running but it also gives me this error:
openhab.service changed on disk. Run ‘systemctl daemon-reload’ to reload units

I googled it and I found a pretty complicated thread.

The unit file, source configuration file or drop-ins of openh ab2.service changed on disk. Run 'systemctl daemon-reload' to reload units

I get the follow error message when stopping openhab2 as a service: The unit file, source configuration file or drop-ins of openh ab2.service changed on disk. Run 'systemctl daemon-reload' to reload units Even if a run this command I receive this message again after each restart. I googled but I just found some database related topics and they don’t really give a hint what caused this and if I need to take care. Has anybody a clue how this message should be interpreted.

Maybe I better reinstall OH3 from scratch.