Lost KDE

[Richy]

I usually use Gnome, while, suddenly, I found I can not run any KDE
program on my Fedora.

The error message was as follows:
-----------------------------------------------------------------
[lichen@Linux lichen]$ kmail
kbuildsycoca running...
DCOP aborting call from 'anonymous-23637' to 'kmail'
[lichen@Linux lichen]$ Mutex destroy failure: device or resource busy

[lichen@Linux lichen]$ kget
kbuildsycoca running...
DCOP aborting call from 'anonymous-23666' to 'kget'
[lichen@Linux lichen]$ Mutex destroy failure: device or resource busy
-----------------------------------------------------------------

Could anyone please give me any hints of how do I lost my KDE?

Thanks for any help!

Regards,
Richy