KDE Plasma 5 error
 

Good morning, fellows. KDE has been showing me this message at start-up. This text keeps in my desktop: (freely translated from Portuguese)

unable to create io-slave. Klauncher said: unknown protocol 'search'

Successive updates of my PCLinuxOS did not solve that. It doesn't affect my work so far (perhaps searches in Dolphin, I don't know, because that is becoming annoying itself).
apt-get update --fix-missing also didn't change that.
Any clues? Thanks!

https://i.ibb.co/WDgszBf/error-Scree...728-104626.png

Are packages kio and kio-extras installed?

Sorry for the delay in my answer. Thar PC is at work. Yes, those packages are installed, and the error persists. System is up to date (rolling release).
I hope I don't have to install it again. PCLinuxOS installation is super easy and fast, however... I wish I don't, right now.