flutter pub run build_runner build not working

Question

when running flutter pub run build_runner build I get this error.

Failed to build build_runner:build_runner:
../../snap/flutter/common/flutter/.pub-cache/hosted/pub.dartlang.org/analyzer-0.41.2/lib/src/error/best_practices_verifier.dart:258:50: Error: The property 'displayString' is defined in multiple extensions for 'TargetKind' and neither is more specific.
 - 'TargetKind' is from 'package:meta/meta_meta.dart' ('../../snap/flutter/common/flutter/.pub-cache/hosted/pub.dartlang.org/meta-1.7.0/lib/meta_meta.dart').
Try using an explicit extension application of the wanted extension or hiding unwanted extensions from scope.
        var kindNames = kinds.map((kind) => kind.displayString).toList()
                                                 ^^^^^^^^^^^^^
../../snap/flutter/common/flutter/.pub-cache/hosted/pub.dartlang.org/analyzer-0.41.2/lib/src/error/best_practices_verifier.dart:1950:14: Context: This is one of the extension members.
  String get displayString {
             ^^^^^^^^^^^^^
../../snap/flutter/common/flutter/.pub-cache/hosted/pub.dartlang.org/meta-1.7.0/lib/meta_meta.dart:91:14: Context: This is one of the extension members.
  String get displayString {
             ^^^^^^^^^^^^^
../../snap/flutter/common/flutter/.pub-cache/hosted/pub.dartlang.org/analyzer-0.41.2/lib/src/error/best_practices_verifier.dart:260:36: Error: The getter 'commaSeparatedWithOr' isn't defined for the class 'List<dynamic>'.
 - 'List' is from 'dart:core'.
Try correcting the name to the name of an existing getter, or defining a getter or field named 'commaSeparatedWithOr'.
        var validKinds = kindNames.commaSeparatedWithOr;

update the version of build_runner it will be work fine

Ameer Hamza
– Ameer Hamza

2022-02-23 11:26:18 +00:00
Commented Feb 23, 2022 at 11:26 — Ameer Hamza
– Ameer Hamza, Commented Feb 23, 2022 at 11:26

Majid · Accepted Answer · 2022-02-23 17:21:08Z

41

This issue is related to outdated dependencies most likely, I had a similar one just today.

Run flutter pub upgrade and it should work!

answered Feb 23, 2022 at 17:21

Majid

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1 Comment

M. Massula Over a year ago

In my case I executed dart pub upgrade and worked as well. Answer found here

Tyler2P · Accepted Answer · 2023-10-06 13:24:17Z

17

dependency_overrides:
  watcher: ^1.1.0

Add these two lines in pubspec.yaml if you are facing:

"The class 'FileSystemEvent' can't be extended, implemented, or mixed in outside of its library because it's a sealed class. abstract class _ConstructableFileSystemEvent implements FileSystemEvent { "

edited Oct 6, 2023 at 13:24

Tyler2P

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answered Sep 25, 2023 at 12:39

Padmanava Karmakar

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3 Comments

Incinerator Over a year ago

This solution worked for me. Care to explain what's going on here?

most200 Over a year ago

In my case I added these lines but I also needed to add pub_semver: ^2.1.4 as an additional dependency override before the error was resolved.

Mitrakov Artem Sep 23 at 21:31

It worked out for me, thanks. But why?

Ash · Accepted Answer · 2024-05-08 21:22:19Z

5

With latest flutter versions you can see the error then Follow below steps :

Deleted pubspec.lock
Run flutter pub get, it install dependencies again run flutter pub run build_runner build --delete-conflicting-outputs.

After this error should be gone.

answered May 8, 2024 at 21:22

Ash

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Comments

oussama methnani · Accepted Answer · 2024-02-09 09:45:39Z

3

dart pub upgrade will fix the problem

edited Feb 9, 2024 at 9:45

answered Oct 16, 2023 at 15:15

oussama methnani

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Comments

Manishyadav · Accepted Answer · 2022-02-23 17:37:54Z

2

Those who are experiencing this problem, just overwrite the "meta" dependency.

just add these lines to pubspec.yaml

dependency_overrides:
meta: 1.6.0

This might solve your issue, and there is well discussed github discussion https://github.com/dart-lang/sdk/issues/46687

answered Feb 23, 2022 at 17:37

Manishyadav

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