Getting following error message while trying to connect to NMC installed in Linux RHEL 6 ,64 bit machine

"could not initialize class COM.legato.gwt.gtpanel.Gtutils"

If I run nsrwatch -s networker in that server it works fine and shows networker window but when trying to access the nmc from windows machine using server:9000 the login window opens on entering the credential an error window pops up "could not initialize class COM.legato.gwt.gtpanel.Gtutils"