An attempt was made to change to a user's home directory, but either that user does not exist or the user's fileserver has not shared (exported) that filesystem.
To check on the existence of a particular user, run the ypmatch(1) or nismatch(1) command, specifying the user name and then the passwd(4) map.
To export filesystems from the remote fileserver, become superuser on that system and run the share(1M) command with the appropriate options. If that system is sharing (exporting) filesystems for the first time, also invoke /etc/init.d/nfs.server start to begin NFS service.
For more information on sharing filesystems, see the share_nfs(1M) man page.