1

Building without sound null safety For more information see https://dart.dev/null-safety/unsound-null-safety

Expected elements are <{}codename>,<{}layoutlib>,<{}api-level> /C:/Users/Manoj/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/modal_bottom_sheet-2.0.0/lib/src/bottom_sheet.dart:303:28: Error: Couldn't find constructor 'VelocityTracker'. _velocityTracker = VelocityTracker(); ^^^^^^^^^^^^^^^ /C:/Users/Manoj/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/flutter_typeahead-3.2.4/lib/src/flutter_typeahead.dart:754:20: 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(this); ^ /C:/Users/Manoj/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/flutter_typeahead-3.2.4/lib/src/flutter_typeahead.dart:767:20: 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(this); ^ /C:/Users/Manoj/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/flutter_typeahead-3.2.4/lib/src/flutter_typeahead.dart:801:20: 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!.addPostFrameCallback((duration) { ^ /C:/Users/Manoj/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/flutter_typeahead-3.2.4/lib/src/flutter_typeahead.dart:936:9: Error: No named parameter with the name 'maxLengthEnforced'. maxLengthEnforced: widget.textFieldConfiguration.maxLengthEnforced, ^^^^^^^^^^^^^^^^^ /C:/src/flutter/packages/flutter/lib/src/material/text_field.dart:276:9: Context: Found this candidate, but the arguments don't match. const TextField({ ^^^^^^^^^ /C:/Users/Manoj/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/flutter_typeahead-3.2.4/lib/src/cupertino_flutter_typeahead.dart:558:20: 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(this); ^ /C:/Users/Manoj/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/flutter_typeahead-3.2.4/lib/src/cupertino_flutter_typeahead.dart:571:20: 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(this); ^ /C:/Users/Manoj/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/flutter_typeahead-3.2.4/lib/src/cupertino_flutter_typeahead.dart:605:20: 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!.addPostFrameCallback((duration) { ^ /C:/Users/Manoj/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/flutter_typeahead-3.2.4/lib/src/cupertino_flutter_typeahead.dart:746:9: Error: No named parameter with the name 'maxLengthEnforced'. maxLengthEnforced: widget.textFieldConfiguration.maxLengthEnforced, ^^^^^^^^^^^^^^^^^ /C:/src/flutter/packages/flutter/lib/src/cupertino/text_field.dart:209:9: Context: Found this candidate, but the arguments don't match. const CupertinoTextField({ ^^^^^^^^^^^^^^^^^^

FAILURE: Build failed with an exception.

  • Where: Script 'C:\src\flutter\packages\flutter_tools\gradle\flutter.gradle' line: 1156

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

Process 'command 'C:\src\flutter\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 1m 27s Running Gradle task 'assembleRelease'... 88.7s Gradle task assembleRelease failed with exit code 1 The terminal process "C:\src\flutter\bin\flutter.bat 'build', 'apk'" terminated with exit code: 1.

Terminal will be reused by tasks, press any key to close it.

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  • Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking. Commented May 17, 2022 at 5:20

2 Answers 2

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this happened to me after I updated flutter version , if you used modal bottom sheet package then just set or update to this version modal_bottom_sheet: ^2.0.1 in pubspec and run pub get

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Duplicate of this

the Packages you use arent updated to Flutter 3.0 yet.

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