Flutter 3 null safety Warnings and Errors [duplicate]

Question

I just upgraded my flutter to the latest version, (3.0.0) and My projects keeps giving me these warnings and Errors:

../../../../flutter/.pub-cache/hosted/pub.dartlang.org/syncfusion_flutter_pdfviewer-20.1.55-beta/lib/src/control/pdf_page_view.dart:196:23: Warning: Operand of null-aware operation '?.' has type 'PaintingBinding' which excludes null.
 - 'PaintingBinding' is from 'package:flutter/src/painting/binding.dart' ('../../../../flutter/packages/flutter/lib/src/painting/binding.dart').
      PaintingBinding.instance?.imageCache?.clear();
                      ^
../../../../flutter/.pub-cache/hosted/pub.dartlang.org/syncfusion_flutter_pdfviewer-20.1.55-beta/lib/src/control/pdf_page_view.dart:197:23: Warning: Operand of null-aware operation '?.' has type 'PaintingBinding' which excludes null.
 - 'PaintingBinding' is from 'package:flutter/src/painting/binding.dart' ('../../../../flutter/packages/flutter/lib/src/painting/binding.dart').
      PaintingBinding.instance?.imageCache?.clearLiveImages();
                      ^
../../../../flutter/.pub-cache/hosted/pub.dartlang.org/syncfusion_flutter_pdfviewer-20.1.55-beta/lib/src/control/pdf_scrollable.dart:397:22: Warning: Operand of null-aware operation '?.' has type 'WidgetsBinding' which excludes null.
 - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../../../flutter/packages/flutter/lib/src/widgets/binding.dart').
      WidgetsBinding.instance?.addPostFrameCallback((Duration timeStamp) {
                     ^
../../../../flutter/.pub-cache/hosted/pub.dartlang.org/syncfusion_flutter_pdfviewer-20.1.55-beta/lib/src/control/pdfviewer_canvas.dart:793:22: Warning: Operand of null-aware operation '?.' has type 'WidgetsBinding' which excludes null.
 - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../../../flutter/packages/flutter/lib/src/widgets/binding.dart').
      WidgetsBinding.instance?.addPostFrameCallback((Duration timeStamp) {
                     ^
../../../../flutter/.pub-cache/hosted/pub.dartlang.org/syncfusion_flutter_pdfviewer-20.1.55-beta/lib/src/control/scroll_head_overlay.dart:288:20: Warning: Operand of null-aware operation '?.' has type 'WidgetsBinding' which excludes null.
 - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../../../flutter/packages/flutter/lib/src/widgets/binding.dart').
    WidgetsBinding.instance?.addPostFrameCallback((Duration timeStamp) {
                   ^
../../../../flutter/.pub-cache/hosted/pub.dartlang.org/cached_network_image-3.2.0/lib/src/image_provider/cached_network_image_provider.dart:109:29: Warning: Operand of null-aware operation '?.' has type 'PaintingBinding' which excludes null.
 - 'PaintingBinding' is from 'package:flutter/src/painting/binding.dart' ('../../../../flutter/packages/flutter/lib/src/painting/binding.dart').
      () => PaintingBinding.instance?.imageCache?.evict(key),
                            ^
../../../../flutter/.pub-cache/hosted/pub.dartlang.org/cached_network_image-3.2.0/lib/src/image_provider/multi_image_stream_completer.dart:152:22: Warning: Operand of null-aware operation '?.' has type 'SchedulerBinding' which excludes null.
 - 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('../../../../flutter/packages/flutter/lib/src/scheduler/binding.dart').
    SchedulerBinding.instance?.scheduleFrameCallback(_handleAppFrame);

Is this a bug in Flutter and Dart, Or should do something about it.

Answer 1

This is because your plugins have not updated to the latest version which make some changes to null safety to the binding widgets.

As stated here null has been excluded from this binding widget: Warning: Operand of null-aware operation '?.' has type 'SchedulerBinding' which excludes null.

The best thing to do is looking if the authors of the plugin have updated their plugin or flutter downgrade to revert to your earlier installed version of Flutter.