Why does a react-native application (native-base, Font.loadAsync) crash after loading a js build?

Question

JavaScript

Hello!
The problem is this, there is an application on react-native, native-base is built into it!
Built on expo-cli , I
execute the
expo-start command
in the browser, a tab opens,
then I try to open the application through Expo App
and after configuring the build, an error occurs:

fontFamily "Roboto_medium" is not a system font and has not been loaded through Font.loadAsync.
- If you intended to use a system font, make sure you typed the name correctly and that it is supported by your device operating system.
- If this is a custom font, be sure to load it with Font.loadAsync.

Yes, I know that this can be solved through componentDidMount via the async Font.loadAsync function,
also I ran the react-native link command to make the link,
but even so it cannot load the font! What can be wrong? and how to make it load?
Why am I not doing via componentDidMount? Did the employee succeed without componentDidMount, or if he has ios loaded for him? do i have an android? so to fix this problem you need to do everything through componentDidMount?