add or remove packages

[Mustafa Orkun]

hi,i am using FC3.
when i try to install packages with "add or remove packages" app,for 
example if i want to install kde development packages i always get error 
messages like:
unlocatable package    required by
arts                   kdeaddons 3.3.1,1
.......the list goes on
and the final:
xorg-x11-libs           xorg-x11 6.8.1 12.FC3.21
xorg-x11-libs           xorg-x11-xfs 6.8.1 12.FC3.21

but,i already have them installed.what's the problem,it really annoys me