Error: Method 'addPostFrameCallback'

[xiaochenghua]

../../../../.pub-cache/hosted/pub.dartlang.org/another_flushbar-1.10.29/lib/flushbar.dart:350:31: Error: Method 'addPostFrameCallback'
cannot be called on 'SchedulerBinding?' because it is potentially null.

[xiaochenghua]

➜ ~ flutter doctor -v
[✓] Flutter (Channel stable, 2.10.2, on macOS 12.4 21F79 darwin-x64, locale zh-Hans-CN)
• Flutter version 2.10.2 at /Users/chenghua/fvm/versions/2.10.2
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision 097d3313d8 (5 months ago), 2022-02-18 19:33:08 -0600
• Engine revision a83ed0e5e3
• Dart version 2.16.1
• DevTools version 2.9.2

[✓] Android toolchain - develop for Android devices (Android SDK version 31.0.0)
• Android SDK at /Users/chenghua/Library/Android/sdk
• Platform android-31, build-tools 31.0.0
• ANDROID_HOME = /Users/chenghua/Library/Android/sdk
• Java binary at: /Applications/Android Studio.app/Contents/jre/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 11.0.11+0-b60-7590822)
• All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 13.1)
• Xcode at /Applications/Xcode.app/Contents/Developer
• CocoaPods version 1.11.2

[✓] Android Studio (version 2021.1)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/6351-dart
• Java version OpenJDK Runtime Environment (build 11.0.11+0-b60-7590822)

[✓] VS Code (version 1.69.0)
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 3.44.0

[✓] Connected device (1 available)
• iPhone 13 (mobile) • DCFCD6AF-9B56-4285-82C6-03268E02C309 • ios • com.apple.CoreSimulator.SimRuntime.iOS-15-0 (simulator)

[✓] HTTP Host Availability
• All required HTTP hosts are available

• No issues found!

[Kuri-Tai]

I have changed pubspec.yaml, then ran flutter clean and flutter pub get. It worked.

...
# another_flushbar: ^1.10.29 # before
another_flushbar: 1.10.28 # after 
# or
another_flushbar: <=1.10.28 # etc.

22c5470#diff-31c0a3f2a09ed06c40eaf4a0ef3a079e92097ac3779f18028d73ced2e457b45a

I guess this commit has changed the relevant code, then it started getting errors with Flutter which versions under 3.0.0.

[Kuri-Tai]

I propose to add a constraint on the version of Flutter in pubspec.yaml as follows,

environment:
  sdk: ...
  flutter: '>=3.0.0'

[cmdrootaccess]

Please upgrade to flutter 3 and this issue will be resolved