You need to make sure that you're using one of these languages - Chinese (Simplified), English (U.K.), English (U.S.), French, Italian, German, and Spanish, and that your Speech language pack is installed.
Udinga uqinisekise ukuthi usebenzisa lezi zilimi - Chinese (Simplified), English (U.K.), English (U.S.), French, Italian, German, neSpanishi, nokuthi Speech ngolimi lwakho pack efakwe.