I'm having a little trouble trying to enable quotas on my server. They are fairly new, so it should already be built into the kernel

I'm probably just being dumb. I properly edited the fstab file, created the aquota.users/group file, and it doesn't seem to work to put the quota on. Here is my error:

quotaon: using //aquota.group on /dev/hda2: Invalid argument
quotaon: using //aquota.user on /dev/hda2: Invalid argument

Thanks in advance for your help.