Strange JACK error mesages

[sonnie]

I just installed a fresh manjaro, installed JACK, added myself to audio group – like always. And I get JACK error messages.
I tried with cadence and qjackctl and jackd.
Error windows (guitarix / mixbus)

Screenshot from 2020-06-07 09-06-24.png (29 KiB) Viewed 676 times

Screenshot from 2020-06-07 09-09-04.png (47.07 KiB) Viewed 676 times

And my cadence. Its set up for realtime (but like always, I have not installed the rt-kernel).

Screenshot from 2020-06-07 09-11-23.png (89.75 KiB) Viewed 676 times

I would be happy for every hint. With exact the same setup it works with another computer, just not on my laptop.
The Pulse-Jack-Bridge works.

[sonnie]

Actually, this is not a real newbie topic. Maybe a mod can move it to the correct sub?

[sonnie]

I solved it. And I feel bad. I had a typo in "realtime" group. :-/