Added less-cryptic error message for 'including.not.activated.entity' error.
Added less-cryptic error message for 'including.not.activated.entity' error.

mccarrmb/moztrap,bobsilverberg/moztrap,shinglyu/moztrap,mccarrmb/moztrap,shinglyu/moztrap,mozilla/moztrap,mccarrmb/moztrap,mozilla/moztrap,mccarrmb/moztrap,mozilla/moztrap,shinglyu/moztrap,shinglyu/moztrap,mozilla/moztrap,bobsilverberg/moztrap,bobsilverberg/moztrap,shinglyu/moztrap,bobsilverberg/moztrap,mccarrmb/moztrap,mozilla/moztrap