Added error message for invalid term reference
Added error message for invalid term reference

diku-kmc/kleenexlang,diku-kmc/repg,diku-kmc/kleenexlang,diku-kmc/repg,diku-kmc/repg,diku-kmc/repg,diku-kmc/kleenexlang,diku-kmc/repg,diku-kmc/kleenexlang,diku-kmc/kleenexlang,diku-kmc/repg,diku-kmc/kleenexlang