Kde plasma # ksmserver, kscreen_backend_launcher, plasmashell MonthView TypeError: Cannot read property 'cellHeight' of null

  • system: "x86_64-linux"
  • host os: Linux 5.15.88, NixOS, 22.11 (Raccoon), 22.11.1705.b83e7f5a04a
  • multi-user?: yes
  • sandbox: yes
  • version: nix-env (Nix) 2.11.1
  • channels(root): "nixos-22.11, nixos-hardware"
  • nixpkgs: /nix/var/nix/profiles/per-user/root/channels/nixos
ksmserver[2434]: Qt: Session management error: networkIdsList argument is NULL
kscreen_backend_launcher[2593]: kscreen.xcb.helper: Event Error:  147
plasmashell[2455]: libkcups: CUPS-Get-Printers last error: 1030 No destinations added.
plasmashell[2455]: file:///nix/store/2sa86qs2qgv62xab6y3zkw5rc8blrndl-plasma-workspace- TypeError: Cannot read property 'cellHeight' of null
                                            #9  0x00007f74f58c7470 _ZN3KIO9SlaveBase5errorEiRK7QString (libKF5KIOCore.so.5 + 0xaa470)
plasmashell[2667]: [2023-01-20T07:16:57Z ERROR style::stylesheets::rule_parser] Saw @import rule, but no way to trigger the load

How to fix it?

Hum, what are you trying to fix exactly? Is is just an error in the log or do you get some crash or whatever? Seems like you just provide a grep error of your journalctl? The log you seem to provide seems to mention multiple unrelated information about network, printers and calendar… For instance since my upgrade I also get this error regarding cellHeight in the log, but I can’t see any issue and this might just be a non-important warning (I’m not a Qt expert, but I often see this kind of errors and it never caused much troubles in my experience). In my experience, if the error is not red in journalctl, it can often be ignored.

both, I check the logs to see some hints
There are issues with apps like rambox (but that will be nvidia related) and qt behavior e.g. in VScodium (File open window is in background of the app itself … )
… brave is partly freezing when loading content/videos …