Updating to the new KDE seems to have caused this problem for OP.
Somewhere I read that KDE 4.6 uses udev / upower for hardware management instead of HAL.
May be it is because the entries of not found are those created by HAL earlier and the new ones by these new fangled things.
I too got the same prompt, I told it to just forget it and have not been bothered hence.
-SS.