ERROR flutter lib ui ui dart state cc 157 Unhandled Exception ServicesBinding defaultBinaryMessenger was accessed before the binding was initialized

Question

Hi Guys,

I have created one table in the Firestore database. I am trying to connect to this database from my flutter app. But it is showing me the below error.

E/flutter ( 8298): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: ServicesBinding.defaultBinaryMessenger was accessed before the binding was initialized.
E/flutter ( 8298): If you're running an application and need to access the binary messenger before `runApp()` has been called (for example, during plugin initialization), then you need to explicitly call the `WidgetsFlutterBinding.ensureInitialized()` first.
E/flutter ( 8298): If you're running a test, you can call the `TestWidgetsFlutterBinding.ensureInitialized()` as the first line in your test's `main()` method to initialize the binding.

Answer 1

Hi@akhtar,

This problem is introduced when you upgrade Flutter. The reason behind this is you are waiting for some data or running an async function inside main(). I was initializing ScopedModel inside main() and inside that, I was waiting for some data. There is a very small fix to avoid this error. You have to initialize this module WidgetsFlutterBinding.ensureInitialized() inside void main() function, before you do runApp() as shown below.

void main() {
  WidgetsFlutterBinding.ensureInitialized();
  Firebase.initializeApp();
  runApp(Mydb());
}