unable to use react-native-vector-icons in snack expo

I am trying to run this code on my snack expo:

https://snack.expo.io/@nhammad/graceful-pretzels

but it keeps giving me an error on the export that:

import Icon from 'react-native-vector-icons/FontAwesome';

Cannot find module 'react-native-vector-icons/FontAwesome'.

Same goes for react-native-size-matters. Why can't I use these in my online project? I also tried changing their versions in the package.json but that doesn't help.