Error Message: find: cannot open /: Stale NFS file handle

I am using the "find" command below and it respond with the error message " find: cannot open /: Stale NFS file handle"

what does it mean?
what can I do about it?

Need advice, thanks.

below are the command that I enter, the respond and the error message:
root@ScripServer:/# find / -name *.tar -print

/var/tmp/NetConnect.003.000.004.tar
/var/tmp/SFS_base_packages.S8.tar
/opt/NTAPdfm/src/rrdtool.tar
/opt/oracle/OraHome1/jdbc/doc/javadoc.tar
/opt/oracle/OraHome1/jdbc/demo/demo.tar
/opt/oracle/OraHome1/javavm/demo/demo.tar
/opt/oracle/OraHome1/jis/patch/c++/login.tar
/opt/jdk1.4/jswdk1_0_1-solsparc.tar
find: cannot open /: Stale NFS file handle

can you "ls /" ?

What does "mount" say?

Try each mount point.

Is your NFS server uncontactable?

Are you time-synchronised to your NFS server?