Getting this issues while app is build on ios ?

[Kedar-jirel]

Describe the bug
flutter_clean_architecture-5.0.4/lib/src/view.dart:142:29: Error: Method 'addObserver' cannot be called on 'WidgetsBinding?' because it is potentially null.

• 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../../Desktop/projects/flutter/packages/flutter/lib/src/widgets/binding.dart').
  Try calling using ?. instead.
  WidgetsBinding.instance.addObserver(_controller);
  ^^^^^^^^^^^
  Failed to package com.example.app.
  Command PhaseScriptExecution failed with a nonzero exit code