initializeYt method Null safety
Implementation
Future<void> initializeYt() async {
final File configFile = Util.defaultCredentialsFile;
if (!configFile.existsSync()) {
throw Exception(
'File: ${configFile.path} could not be found. This is a required file.');
}
_yt = await Yt.withOAuth(OAuthCredentials.fromJsonFile(configFile));
}