Error 400: redirect_uri_mismatch You can't sign in to this app because it doesn't comply with Google's OAuth 2.0 policy. If you're the app developer, register the redirect URI in the Google Cloud Console. redirectに入れるってのはわかるけど…

E/flutter (32449): [ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: Null check operator used on a null value E/flutter (32449): #0 MethodChannelFirebaseMessaging.registerBackgroundMessageHandler (package:firebase_messaging…

原形 ring /rɪŋ/ リング 過去形 rang /ræŋ/ ラング 過去分詞 rung /rʌŋ/ ラング 過去分詞・・・Past participle