React Navigation TabBar Does not display -


i try add tabbar navigation , not display. stacknavigator works fine though. idea ?

class app extends react.component {    render(){       const mainnavigator =       stacknavigator({       welcomeslides: {screen: welcomeslides},       home: { screen: firebasereactnative },       details: { screen: worditem },       daily : {         screen: tabnavigator({           home : {screen: firebasereactnative},         })       }// closes daily     });     return(     <mainnavigator />     );   } }


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