Just a quick post in case this helps someone.
My PC (Fedora 42) has just updated to KDE Plasma 6.4.
Immediately, every time I locked the session (Super key + L), an error appeared on the screen
The screen locker is broken and unlocking it is not possible anymore. In order to unlock it, switch to a virtual terminal (e.g. Ctrl+Alt+F1), log in to your account and execute the command:
loginctl unlock-session 2
Then log out of the virtual session by pressing Ctrl+D, and switch back to the running session (Ctrl+Alt+F2).
Should you have forgotten the instructions, you can get back to this screen by pressing Ctrl+Alt+F2.
Firstly, for some reason, tty1 wouldn't work, so I needed to use Ctrl+Alt+F3 to get to tty3.
But I didn't want to be doing that every time my session locked.
Searching the web I found various bug reports (none recent) that sounded similar. There was nothing in the KDE bug tracker to match the error (that was opened since the Plasma 6.4 release). I went down various blind alleys that didn't help: changing my wallpaper from picture of the day to a fixed image, looking into the error file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/lockscreen/LockOsd.qml:10:1: "../osd": no such directory, and the error "ml: The backend got an unknown wallpaper provider type. Both those errors were popping up in journalctl at exactly the moment I locked my session and got the error message.
In the end, something someone posted somewhere prompted me to change the desktop theme. I simply opened the Settings app, and clicked to choose Breeze Dark.
Now my sessions lock and unlock without a hitch.
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