React-Native-Elements icons showing as (?)
What am I doing wrong? The code looks nearly identical to the sample that they provided on their site.
This is what I see (don't mind the middle icon, it's brought in differently):

Code that I'm using for the left icon:
<Icon name='users' type='Feather' size={25} color={tintColor} />
Code for the right icon:
GamesInProgressTab: {
screen: GamesInProgressNavigator,
navigationOptions: {
title: 'Games',
tabBarIcon: ({ tintColor }) => ( <Icon name='rocket' type='Entypo' size={25} color={tintColor} /> ),
}
}