Error when building cvs server

WhiteBear

I'm trying to create a cvs pserver on my own computer. The repository directory is /Repositories. After typeing
[code:1]
#cvs -d /Repositories init
[/code:1]

I've midified /etc/xinetd.d/cvspserver, changed disable = yes to disable=no
And restarted xinetd
[code:1]
#/etc/init.d/xinetd restart
[/code:1]

After that, I've created /Repositories/CVSROOT/passwd with my shadow file. added "test_user1" into /Repositories/CVSROOT/writers.

The server construction was finished(At least I thought). I logged in with test_user1 by the following command:
[code:1]
$ cvs -d :pserver:test_user1@localhost:/Repositories login
Logging to :pserver:test_user1@localhost:/Repositories
CVS Password:
$
[/code:1]
Login seemed OK, but when I'm trying to import an project, some error occured.
[code:1]
$cvs -d :pserver:test_user1@localhost:/Repositories import test_project1 jrandom start
PAM open session error: System error
cvs [import aborted]: end of file from server (consult above message if any)
[/code:1]
Anyone know what's going on here and how to fix it?