Mounting USB as a normal user

[rex]

http://www.freebsd.org/doc/en/books/...usb-disks.html

I followed the handbook to configure BDS to mount usb drives as a normal user. I'm able to do it just fine with root user. But some thing is wrong for normal user. user is of operator group.

Here is what I see when FreeBSD boots up.

/etc/rc: WARNING: devfs_set_ruleset: you must specify a ruleset number
/etc/rc: WARNING: devfs_apply_ruleset: you must specify a ruleset

This must be either because I added

[localrules=5]
add path 'da*' mode 0660 group operator

to /etc/devfs.rules

or

devfs_system_ruleset="localrules"

to /etc/rc.conf

Here is what I see when I try to mount USB drive

> mount -t msdosfs /dev/da4s1 /mnt/usb/
mount_msdosfs: /dev/da4s1: : Operation not permitted

Any suggestion what might be wrong over here?