Unable to resolve "@react-native-community/masked-view

The @react-native-community/masked-view is a dependency you need to install to work with the the navigation stack.

Try doing:

expo install @react-native-community/masked-view

You haven't followed the installation instructions for React Navigation.

Since you're using Expo, you should run

expo install react-native-gesture-handler react-native-reanimated react-native-screens react-native-safe-area-context @react-native-community/masked-view

, as per the getting started docs.