Where are the Plasma components?

[Valter Mura]

Hi All,

using Kubuntu Intrepid with KDE 4.2.0

Whien I try to add "some widgets" from the plasma window (top right corner of 
the desktop), many of them "tell" me, from a square window, that the widget 
cannot add to the desktop because it "could not find the requested component".

How is this possible? If i can see them in the plasmoid list, why there is no 
component available?
Is this an update problem?
Where could I find the requested components and where do I have to install 
them?

TIA and regards,
-- 
Valter
Registered Linux User #466410  http://counter.li.org
Kubuntu Linux: www.ubuntu.com
Usa OpenOffice.org: www.openoffice.org