"What does the error mean and how do I go about fixing it."
This error usually means that the mount command was given the wrong file system type. Use the command line to test out the mount command:
mount -t xxxx /dev/hdb1 /whatever.directory
to find out what file system type to substitute for xxxx.
Once you get the file system type figured out then you can set the default file system type for that mountable device in /etc/fstab.
Be prepared. Create a LifeBoat CD.