too many error with flutter 3.0.5 help me please

[Benzhtb]

Running Gradle task 'assembleDebug'...
Warning: Mapping new ns http://schemas.android.com/repository/android/common/02 to old ns http://schemas.android.com/repository/android/common/01
Warning: Mapping new ns http://schemas.android.com/repository/android/generic/02 to old ns http://schemas.android.com/repository/android/generic/01
Warning: Mapping new ns http://schemas.android.com/sdk/android/repo/addon2/02 to old ns http://schemas.android.com/sdk/android/repo/addon2/01
Warning: Mapping new ns http://schemas.android.com/sdk/android/repo/addon2/03 to old ns http://schemas.android.com/sdk/android/repo/addon2/01
Warning: Mapping new ns http://schemas.android.com/sdk/android/repo/repository2/02 to old ns http://schemas.android.com/sdk/android/repo/repository2/01
Warning: Mapping new ns http://schemas.android.com/sdk/android/repo/repository2/03 to old ns http://schemas.android.com/sdk/android/repo/repository2/01
Warning: Mapping new ns http://schemas.android.com/sdk/android/repo/sys-img2/03 to old ns http://schemas.android.com/sdk/android/repo/sys-img2/01
Warning: Mapping new ns http://schemas.android.com/sdk/android/repo/sys-img2/02 to old ns http://schemas.android.com/sdk/android/repo/sys-img2/01
Warning: unexpected element (uri:"", local:"base-extension"). Expected elements are <{}codename>,<{}layoutlib>,<{}api-level>
/C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/qr_code_scanner-0.6.1/lib/src/qr_code_scanner.dart:68:20: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.

• 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/C:/src/flutter/packages/flutter/lib/src/widgets/binding.dart').
  WidgetsBinding.instance!.addObserver(_observer);
  ^
  /C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/qr_code_scanner-0.6.1/lib/src/qr_code_scanner.dart:86:20: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
• 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/C:/src/flutter/packages/flutter/lib/src/widgets/binding.dart').
  WidgetsBinding.instance!.removeObserver(_observer);
  ^
  /C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/infinite_scroll_pagination-3.1.0/lib/src/ui/paged_sliver_builder.dart:257:24: Warning: Operand of null-aware operation '?.' has type 'WidgetsBinding' which excludes null.
• 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/C:/src/flutter/packages/flutter/lib/src/widgets/binding.dart').
  WidgetsBinding.instance?.addPostFrameCallback((_) {
  ^
  /C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_math_fork-0.5.0/lib/src/widgets/selectable.dart:459:24: Warning: Operand of null-aware operation '!' has type 'SchedulerBinding' which excludes null.
• 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('/C:/src/flutter/packages/flutter/lib/src/scheduler/binding.dart').
  SchedulerBinding.instance!.addPostFrameCallback((_) {
  ^
  /C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_math_fork-0.5.0/lib/src/widgets/selection/overlay_manager.dart:138:28: Warning: Operand of null-aware operation '!' has type 'SchedulerBinding' which excludes null.
• 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('/C:/src/flutter/packages/flutter/lib/src/scheduler/binding.dart').
  if (SchedulerBinding.instance!.schedulerPhase ==
  ^
  /C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_math_fork-0.5.0/lib/src/widgets/selection/overlay_manager.dart:140:26: Warning: Operand of null-aware operation '!' has type 'SchedulerBinding' which excludes null.
• 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('/C:/src/flutter/packages/flutter/lib/src/scheduler/binding.dart').
  SchedulerBinding.instance!
  ^
  /C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_math_fork-0.5.0/lib/src/widgets/selection/web_selection_manager.dart:119:24: Warning: Operand of null-aware operation '!' has type 'SchedulerBinding' which excludes null.
• 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('/C:/src/flutter/packages/flutter/lib/src/scheduler/binding.dart').
  SchedulerBinding.instance!
  ^
  /C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_math_fork-0.5.0/lib/src/widgets/selection/overlay.dart:141:26: Warning: Operand of null-aware operation '!' has type 'SchedulerBinding' which excludes null.
• 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('/C:/src/flutter/packages/flutter/lib/src/scheduler/binding.dart').
  if (SchedulerBinding.instance!.schedulerPhase ==
  ^
  /C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_math_fork-0.5.0/lib/src/widgets/selection/overlay.dart:143:24: Warning: Operand of null-aware operation '!' has type 'SchedulerBinding' which excludes null.
• 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('/C:/src/flutter/packages/flutter/lib/src/scheduler/binding.dart').
  SchedulerBinding.instance!.addPostFrameCallback(_markNeedsBuild);
  ^
  /C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_math_fork-0.5.0/lib/src/widgets/selection/overlay.dart:193:26: Warning: Operand of null-aware operation '!' has type 'SchedulerBinding' which excludes null.
• 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('/C:/src/flutter/packages/flutter/lib/src/scheduler/binding.dart').
  if (SchedulerBinding.instance!.schedulerPhase ==
  ^
  /C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_math_fork-0.5.0/lib/src/widgets/selection/overlay.dart:195:24: Warning: Operand of null-aware operation '!' has type 'SchedulerBinding' which excludes null.
• 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('/C:/src/flutter/packages/flutter/lib/src/scheduler/binding.dart').
  SchedulerBinding.instance!.addPostFrameCallback(_markNeedsBuild);
  ^
  Note: C:\src\flutter.pub-cache\hosted\pub.dartlang.org\device_info-2.0.3\android\src\main\java\io\flutter\plugins\deviceinfo\DeviceInfoPlugin.java uses unchecked or unsafe operations.
  Note: Recompile with -Xlint:unchecked for details.
  Note: Some input files use or override a deprecated API.
  Note: Recompile with -Xlint:deprecation for details.
  Note: Some input files use unchecked or unsafe operations.
  Note: Recompile with -Xlint:unchecked for details.
  e: C:\src\flutter.pub-cache\hosted\pub.dartlang.org\qr_code_scanner-0.6.1\android\src\main\kotlin\net\touchcapture\qr\flutterqr\QRView.kt: (23, 1): Class 'QRView' is not abstract and does not implement abstract member public abstract fun onRequestPermissionsResult(p0: Int, p1: Array<(out) String!>, p2: IntArray): Boolean defined in io.flutter.plugin.common.PluginRegistry.RequestPermissionsResultListener
  e: C:\src\flutter.pub-cache\hosted\pub.dartlang.org\qr_code_scanner-0.6.1\android\src\main\kotlin\net\touchcapture\qr\flutterqr\QRView.kt: (217, 26): Null can not be a value of a non-null type String
  e: C:\src\flutter.pub-cache\hosted\pub.dartlang.org\qr_code_scanner-0.6.1\android\src\main\kotlin\net\touchcapture\qr\flutterqr\QRView.kt: (248, 26): Null can not be a value of a non-null type String
  e: C:\src\flutter.pub-cache\hosted\pub.dartlang.org\qr_code_scanner-0.6.1\android\src\main\kotlin\net\touchcapture\qr\flutterqr\QRView.kt: (301, 5): 'onRequestPermissionsResult' overrides nothing
  e: C:\src\flutter.pub-cache\hosted\pub.dartlang.org\qr_code_scanner-0.6.1\android\src\main\kotlin\net\touchcapture\qr\flutterqr\QRViewFactory.kt: (10, 1): Class 'QRViewFactory' is not abstract and does not implement abstract base class member public abstract fun create(p0: Context?, p1: Int, p2: Any?): PlatformView defined in io.flutter.plugin.platform.PlatformViewFactory
  e: C:\src\flutter.pub-cache\hosted\pub.dartlang.org\qr_code_scanner-0.6.1\android\src\main\kotlin\net\touchcapture\qr\flutterqr\QRViewFactory.kt: (13, 5): 'create' overrides nothing

FAILURE: Build failed with an exception.

• What went wrong:
  Execution failed for task ':qr_code_scanner:compileDebugKotlin'.

Compilation error. See log for more details

• 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 1m 45s
Exception: Gradle task assembleDebug failed with exit code 1

[IoTThinks]

Writing a new app is faster than debugging this source code.

[IoTThinks]

Btw, need to change version to qr library.

You can search the Issue for it.

[ybeshkarov]

Hello @Benzhtb!

Please try with the latest source code base it should work.