Error while logging in

[Pietro Ferrera]

Hi all! 
I managed to install the distro (standard install, config.scm is pretty much 
the default desktop.scm, just a /home partition added) with almost no problem, 
but I can only log in as root. Whenever I try to login as a normal user I get 
the following warning

"failed to execute login command"

and get thrown back to the login screen.

This happens both with ratpoison and xfce
Can someone help me? 
Thanks a lot,

P.