Mount point 0 - Sharing a fat32 partition

Hi to everyone.

I'm absolutely new to this mailing list, but I have a problem difficult
enough
 for all my friends...
After I have changed my fstab with the line:

/dev/hdb1    /mnt/fat   vfat           defaults,umask=000  0 0

to automounted my hdb1 fat partition (the /mnt/fat directory already
exist),
during the loading phase of the system, I get the following report:

Mounting local file system: mount: the mount point 0 does not exist.
Failed.
(I translate the message from my italian version of RH 9.A second
edition)

What does it mean "mount point 0" ?
...and what can i do to get round the previous failure ?

I also try to change the fstab with the line:

/dev/hdb1    /mnt/fat   vfat           noauto,owner,user  0 0

but I get the same failure notification.

Yours sincerely,
Giampiero