Can't start KDE or TWM with KDM

[Frank Petitjean]

Hi,
I have a problem when I try to lauch KDE or TWM with KMD.

After I entered the login and password, under KDM window, after a while I  
have the message :
"the following installation problem was detected while trying to start KDE
could not find 'iceauth in path
KDE is unable to start"

With TWM I don't have any message, but it does not work too.

I launch KDM as a root user, and don't set up any environment variable  
before.

Any ideas ?

Thanks.

Frank.