FC6下的nfs mount的问题

jims

[root@abc ~]# mount 172.16.220.254:/share /share
mount: wrong fs type, bad option, bad superblock on 172.16.220.254:/share,
       missing codepage or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so

怎么会出现这种现象?