change a user's MCS category

[Tyler Durvik]

I have 3 levels set up using MCS under the targeted policy:

s0                             SystemLow
s0-s0:c0.c1023                 SystemLow-SystemHigh
s0-s0:c0.c1023                 SystemHigh
s0:c0                       A
s0:c1                       B
s0:c2                       C

I have 3 users set up and I want to assign an MCS category to each of
them.  So for instance:

bob -> A
joe -> B
sue -> C

how can I do this?  I have tried the examples at James Morris's blog
http://james-morris.livejournal.com/8228.html

I get the following error:

[root@fedora11sel targeted]# chcat -l --  +c0 bob
libsemanage.validate_handler: MLS range s0-s0:c0 for Unix user bob
exceeds allowed range s0 for SELinux user user_u (No such file or
directory).
libsemanage.validate_handler: seuser mapping [bob -> (user_u,
s0-s0:c0)] is invalid (No such file or directory).
libsemanage.dbase_llist_iterate: could not iterate over records (No
such file or directory).
/usr/sbin/semanage: Could not commit semanage transaction

Thanks for any help you may have