Restart your nfs services.
Read this below threads for more info.
http://h30499.www3.hp.com/t5/General/rpc-rstatd-daemon-keeps-dying-on-me/m-p/5262827#M178192
http://h30499.www3.hp.com/t5/Networking/Cannot-start-rstatd/m-p/2619370#M7467
http://h30499.www3.hp.com/t5/System-Administration/cannot-start-rpc-rstat/m-p/4297971#M337629