Kerberos authentication on apach2

Hello,
I'm working with subversion 1.4.5 on a UNIX server.
The clients are working with windows XP.
I'm trying to raise a Kerberos authentication on my Apache server in order to log-in to the repositories with the users smart card,as a single sign on protocol.
 
I've attached the configuration i did so far and the error messages I'm getting.
 
Can anyone help me?
 
Thanks in advanced,
Liat Katzir.

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