Successfully upgraded to 16.0 but something prevents me to access to desktop

laptop n°2-on my laptop TUXEDO InfinityBook Pro fresh upgraded from LEAP 15.6 KDE to leap 16.0
ssd disk=2Tb, CPU= Intel Core i7-8565U, RAM=32Gb, GPU=Intel UHD Graphics 620 (Whiskey Lake) Driver: “i915”;
boot=tri boot (leap 15.5, leap 16.0, windows 10)

I successfully upgraded from 15.6 to 16.0 via
opensuse-migration-tool version 20260204.2cf77a3-lp156.25.1
running sudo LANG=C opensuse-migration-tool
selecting:
selinux
20_ia32

boot is ok, grub keeped all the entries, login with plasma wayland is ok but a white screen prevents me to access to desktop
error at startup-Screenshot_20260227_170022.png
the error written upperleft is
Error loading Applet: package does not exist.
everything seems to works but
how can I close that window and access to my desktop?

sorry the picture of the screen is this:

You use an unusual setup. Two menubars. One of them seem to contain an applet which is no longer available for Plasma 6 and thus creates an error message.
On the left bar, there are at least 4 broken applet entries (no icon).
As you also seem to have 6 virtual desktops, does this error window appear on all of them?

yes it appears on all of them

on heleftmenubar the no icon applet are
brave web browser that I will install
operaweb browser that I will install
signal messenger that I will install
no one of them are automaticalli started

this error doesn’t appear on the other activity if this can help

solved [here](https://solved clicking on systemsettings>global theme>switching to a global theme and selecting both “appearence desktop” and “dektop and windows layout”)

clicking on systemsettings>global theme>switching to a global theme and selecting both “appearence desktop” and “dektop and windows layout”