Null error

[rajeshkumaradam666]

/G:/flutter2.10.5/.pub-cache/hosted/pub.dartlang.org/responsive_framework-0.1.8/lib/responsive_wrapper.dart:622:29: Error: Method 'addObserver' cannot be called on 'WidgetsBinding?' because it is potentially null.

• 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/G:/flutter2.10.5/packages/flutter/lib/src/widgets/binding.dart'). Try calling using ?. instead. WidgetsBinding.instance.addObserver(this); ^^^^^^^^^^^ /G:/flutter2.10.5/.pub-cache/hosted/pub.dartlang.org/responsive_framework-0.1.8/lib/responsive_wrapper.dart:623:29: Error: Method 'addPostFrameCallback' cannot be called on 'WidgetsBinding?' because it is potentially null.
• 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/G:/flutter2.10.5/packages/flutter/lib/src/widgets/binding.dart'). Try calling using ?. instead. WidgetsBinding.instance.addPostFrameCallback((_) { ^^^^^^^^^^^^^^^^^^^^ /G:/flutter2.10.5/.pub-cache/hosted/pub.dartlang.org/responsive_framework-0.1.8/lib/responsive_wrapper.dart:635:29: Error: Method 'removeObserver' cannot be called on 'WidgetsBinding?' because it is potentially null.
• 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/G:/flutter2.10.5/packages/flutter/lib/src/widgets/binding.dart'). Try calling using ?. instead. WidgetsBinding.instance.removeObserver(this); ^^^^^^^^^^^^^^ /G:/flutter2.10.5/.pub-cache/hosted/pub.dartlang.org/responsive_framework-0.1.8/lib/responsive_wrapper.dart:645:29: Error: Method 'addPostFrameCallback' cannot be called on 'WidgetsBinding?' because it is potentially null.
• 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/G:/flutter2.10.5/packages/flutter/lib/src/widgets/binding.dart'). Try calling using ?. instead. WidgetsBinding.instance.addPostFrameCallback((_) { ^^^^^^^^^^^^^^^^^^^^

FAILURE: Build failed with an exception.

• Where: Script 'G:\flutter2.10.5\packages\flutter_tools\gradle\flutter.gradle' line: 1102

• What went wrong: Execution failed for task ':app:compileFlutterBuildDebug'.

  Process 'command 'G:\flutter2.10.5\bin\flutter.bat'' finished with non-zero exit value 1

• Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

• Get more help at https://help.gradle.org

BUILD FAILED in 16s Exception: Gradle task assembleDebug failed with exit code 1

[sleewok]

I updated to flutter 3 and this issues went away for me.

[rayliverified]

I've released a v0.1.9 as a compatibility release for Flutter v2. Once you migrate to Flutter v3, please use v0.2.0.