Hi. In regards to several of the warnings you are getting, there seems to be an inconsistency in the file naming convention. If you go to

/usr/share/kservicetypes5

you will see that the file (or services) do not have a dash in the name.

That is

kwin-effect.desktop

is called

kwineffect.desktop

in the directory. Although probably not the best solution, I just made a symbolic link to the correct file in the same directory.