Unable to load script

Let’s say my company’s Mattermost server URL is: https://internalchat.myawesomecompany.net
So I created assets/override/config.json:

  "DefaultServerUrl": "https://internalchat.myawesomecompany.net",
  "AutoSelectServerUrl": true

And after providing my Android keystore file, I build the APK by invoking make build-android
Yes, the APK was succesfully built. But when running it, I encountered this error:

Then just a blank white screen with Mattermost logo. What’s wrong here?