rpcinfo: can't contact portmapper: RPC: Remote system error - Connection refused

[Tapas Mishra]

I am created an NFS share on a Desktop(Ubuntu 10.10 64  bit)
 which has a USB hard disk attached.
Started the NFS Kernel Daemon and entered the directory name in /etc/exports
the directory exists.
On the client machine which is Ubuntu 10.04 server edition when I
tried to mount the share
mount -t nfs IP:/path/to/share /mnt/local
got following error
mount: wrong fs type, bad option, bad superblock on IP:/path/to/share
       missing codepage or helper program, or other error
       (for several filesystems (e.g. nfs, cifs) you might
       need a /sbin/mount.<type> helper program)
       In some cases useful info is found in syslog - try
       dmesg | tail  or so


when I checked rpcinfo -p

then got following  error

rpcinfo: can't contact portmapper: RPC: Remote system error - Connection refused

what else do I need to do?