flutter pub run build_runner build failed

Question

flutter version:

flutter_macos_v1.9.1+hotfix.2-stable

create new project in terminal:

flutter create myapp

open vscode, edit pubspec.yaml:

dependencies:
  json_annotation: ^3.0.0

dev_dependencies:
  build_runner: ^1.7.0
  json_serializable: ^3.2.2

get packages in terminal:

flutter pub get

new /lib/user.dart and filling below:

import 'package:json_annotation/json_annotation.dart';

part 'user.g.dart';

@JsonSerializable()
class User extends Object {
  @JsonKey(name: 'seed')
  String seed;

  @JsonKey(name: 'results')
  int results;

  @JsonKey(name: 'page')
  int page;

  @JsonKey(name: 'version')
  String version;

  User(
    this.seed,
    this.results,
    this.page,
    this.version,
  );

  factory User.fromJson(Map<String, dynamic> srcJson) =>
      _$UserFromJson(srcJson);

  Map<String, dynamic> toJson() => _$UserToJson(this);
}

run flutter pub run build_runner build in terminal:

[INFO] Generating build script...
[INFO] Generating build script completed, took 321ms

[INFO] Creating build script snapshot......
[INFO] Creating build script snapshot... completed, took 10.4s

[INFO] Initializing inputs
[INFO] Building new asset graph...
[INFO] Building new asset graph completed, took 698ms

[INFO] Checking for unexpected pre-existing outputs....
[INFO] Checking for unexpected pre-existing outputs. completed, took 2ms

[INFO] Running build...
[SEVERE] json_serializable:json_serializable on lib/user.dart:

Invalid argument(s): Path must be absolute : dart:core
[SEVERE] json_serializable:json_serializable on lib/main.dart:

Invalid argument(s): Path must be absolute : dart:core
[SEVERE] json_serializable:json_serializable on test/widget_test.dart:

Invalid argument(s): Path must be absolute : dart:core
[INFO] Running build completed, took 1.5s

[INFO] Caching finalized dependency graph...
[INFO] Caching finalized dependency graph completed, took 36ms

[SEVERE] Failed after 1.6s

why never succeeded?!

Describe what you try to achieve instead of only posting the code, that would help others understand the question. Do not try to bypass stackoverflow restrictions — Cleptus, Sep 20 '19 at 07:56
Dart 2.0 has some sort of bug with that same error message. https://github.com/dart-lang/sdk/issues/33551 — Cleptus, Sep 20 '19 at 08:00
He's trying to automage Json serialization, as i am, and running into the same kind of error. Doesn't make any sense. This is what we're following: https://flutter.dev/docs/development/data-and-backend/json#serializing-json-using-code-generation-libraries HELP — morgred, Sep 20 '19 at 11:32
Did you resolve this? I have the same issue. I cannot figure it out. — Oliver Dixon, Sep 20 '19 at 12:12
@bradbury9 automated json serialization/deserialization, check my other comment — morgred, Sep 20 '19 at 12:58
make sure the class name is same with the generated file name. For ex: part 'User.g.dart'; class User { } — Mr B, Dec 25 '20 at 17:02

score 100 · Answer 1 · answered Jul 16 '20 at 11:49

100

Try this.

flutter pub get && flutter pub run build_runner build --delete-conflicting-outputs

answered Jul 16 '20 at 11:49

VasilKanev

1,392
1
6
9

1

For web version, just append web... `flutter pub get && flutter pub run build_runner build --delete-conflicting-outputs web` – Marcello DeSales Dec 27 '21 at 22:59
For some reason, I am forced to run flutter pub get every time even though there isn't anything to get. But it's just a minor inconvenience... – Jagadish Nallappa Jun 12 '22 at 11:01

Noorus Khan · Answer 2 · 2020-08-10T19:00:05.243

43

add dependency in pubsec.yaml, analyzer: '0.39.14'

flutter clean
flutter pub cache repair
flutter pub run build_runner clean

Then run,

flutter pub run build_runner build

edited Aug 10 '20 at 19:00

answered Aug 10 '20 at 07:33

Noorus Khan

1,342
3
15
33

9

add `flutter pub get` after `flutter pub run build_runner clean` and it worked for me! – Dan Archer Online Apr 07 '21 at 16:18
worked for me with ```flutter pub run build_runner clean``` – Mostafa Mahmoud Aug 04 '22 at 10:28
Finally! This worked for me, when everything else failed. – Benny Bottema Jun 02 '23 at 19:28

score 24 · Answer 3 · answered Apr 01 '21 at 09:26

24

I tried with many solutions, But error not gone. flutter packages pub run build_runner watch command ran with endless log.

I deleted pubspec.lock and ran flutter pub get and installed dependency again and ran above command. After this error gone.

answered Apr 01 '21 at 09:26

Supun Sandaruwan

1,814
19
19

1

This really helped to solve my problem. Thanks! – matteoh Dec 04 '21 at 19:37
1

this should be accepted answer! – dark_ruby Dec 13 '21 at 14:20
1

you solved my hours! thank you! – aligur Feb 13 '22 at 12:27
1

This one solved issue for ../pub_semver-2.1.1/lib/src/version_constraint.dart:96:13: Error: Method not found: 'FallThroughError'. for me. – siripan Jul 10 '23 at 05:04

score 7 · Answer 4 · edited Mar 29 '20 at 07:46

7

I had the same issue, so I just saved the changes first in the class (in your case User class).
And then I just retried using:

flutter pub run build_runner build

edited Mar 29 '20 at 07:46

סטנלי גרונן

2,917
23
46
68

answered Mar 29 '20 at 02:43

Augusto Castro Vera

71
1
3

This answer worked for me. I was stuck trying to get `graphql_codegen` building and the docs say `dart run build_runner build`, but even swapping out _dart_ with _flutter_ wouldn't work. The trick was adding _pub_ just like you have it here: `flutter pub run build_runner build` – chemturion Nov 28 '22 at 23:10

score 6 · Answer 5 · answered Jun 03 '21 at 09:37

6

Please create default empty constructor for models class before flutter packages pub run build_runner build command

answered Jun 03 '21 at 09:37

Suhad Bin Zubair

717
7
10

score 3 · Answer 6 · answered Dec 06 '19 at 14:15

3

It might not be the case in this situation, but I had a similar problem caused by my auto formatter removing this line:

part 'my_class.g.dart';

Once I added that line and ran the command again it worked fine.

answered Dec 06 '19 at 14:15

Andy

723
9
24

score 3 · Answer 7 · answered Aug 18 '20 at 21:38

3

I got this to work with the latest build_runner and json_serializable versions after a long process of trying all of the above suggestions: build_runner: ^1.10.2 json_serializable: ^3.4.0 Not sure what ultimately worked, but looks like one of the issues in my case was a slightly outdated dart SDK, so that's one more thing to keep an eye on

answered Aug 18 '20 at 21:38

yulkin

31
1

Thanks for this answer! build_runner: ^1.10.2 requires Dart version 2.-10.0+, therefore, I changed the version to 1.10.1, and luckily it worked. – Almett Oct 01 '20 at 10:18

score 2 · Answer 8 · answered Sep 20 '19 at 12:24

2

I had the same issue.

Successfully generating all *.g.dart files with:

build_runner 0.9.2

json_serializable 0.5.8+1

json_annotation 0.2.9+1

answered Sep 20 '19 at 12:24

Karthikc

31
2

score 2 · Answer 9 · answered Sep 22 '19 at 11:13

2

Looks like Analyzer is breaking it, downgrading to analyzer: 0.38.2 solved it for me.

Source: https://github.com/dart-lang/sdk/issues/38499#issuecomment-533812652

answered Sep 22 '19 at 11:13

Reda Lazri

131
3

Had the issue using Moor and this solution worked for me. – philba888 Sep 25 '19 at 05:58

score 1 · Answer 10 · answered Jan 06 '22 at 12:24

1

I had the same error. I simply installed the build runner package in pubspec.yaml file like -

dev_dependencies:

build_runner: ^1.3.1

mobx_codegen: ^0.3.9

answered Jan 06 '22 at 12:24

samin

482
5
9

score 1 · Answer 11 · answered Feb 05 '22 at 11:05

1

you may need hive_generator in your dependencies

answered Feb 05 '22 at 11:05

mostafa sami

48
3

score 0 · Answer 12 · answered Aug 24 '20 at 06:09

0

Update 2020/8/24: seems to break build_runner or json_serializable in version:

Analyzer: 0.39.16

Going back to dart analyzer version:

Analyzer: 0.39.14

fixed it for me. So, something is broken in 0.39.16.

answered Aug 24 '20 at 06:09

Jiten Basnet

1,623
15
31

i had an analyzer issue as well, however i wasn't as far as i was aware using it. Neither had i specified a versino to use. So i assumed that this was a cache issue and ran flutter clean and flutter pub get to hopefully reset the cache. I also found out that intellij had automatically commited my .g.dart files, which breaks the runner. So could be erroneous reporting. Who knows. – Emile Nov 02 '21 at 15:40

score 0 · Answer 13 · edited Jul 17 '23 at 09:02

0

make sure the class name is same with the generated file name. For ex:

part 'User.g.dart';

class User {

}

edited Jul 17 '23 at 09:02

אורי orihpt

2,358
2
16
41

answered Dec 25 '20 at 17:03

Mr B

99
1
7

That's actually wrong, the class name part should be always lower case: `part 'user.g.dart'` – novas1r1 Jul 16 '22 at 07:23
Actually it's correct, the 'part' should be the same as the file name, even if it starts with uppercase – alfietap Jan 03 '23 at 05:35

score 0 · Answer 14 · answered Jul 15 '22 at 22:25

0

My class name was:

class Game

but my filename was game_model.dart So you'll need to use:

part 'game_model.g.dart';

You may also need to add hive_generator dependency.

answered Jul 15 '22 at 22:25

tazboy

1,685
5
23
39

score 0 · Answer 15 · answered Jan 28 '23 at 11:48

0

Looks like flutter clean is resolving the issue. Try running it before i.e. openApi Generator.

answered Jan 28 '23 at 11:48

Cyber

2,194
4
22
41

score 0 · Answer 16 · edited Mar 12 '23 at 11:00

0

This is working you should definitely try it

I was getting the message "Success after 1.0 seconds with 0 output (0 actions)" when I used it with dart frog. He needed to create a "bin" file and put the factories in it so he could see it. This worked for me!

Image of Code

edited Mar 12 '23 at 11:00

Throvn

795
7
19

answered Feb 28 '23 at 22:20

merterkoc

1
1

Please copy and paste the precise code or file tree here directly. Images are hard to read, have bad accessibility and deliver a lot of unnecessary information. – Throvn Mar 04 '23 at 16:40

score 0 · Answer 17 · answered May 23 '23 at 23:40

In my side I edited the build_runner_core-version package source code outside my flutter project with adding a method to the class BuildForInputLogger in the following code below:

Stream<Level?> get onLevelChanged {

return Stream.empty(); }

And yeah it's worked to me

score 0 · Answer 18 · answered Jul 09 '23 at 09:13

0

First make sure to maintain small letter and underscore style here:

part 'course_box.g.dart';

Then, run this:

dart pub run build_runner build --delete-conflicting-outputs

It worked for me.

answered Jul 09 '23 at 09:13

Maharun Afroz

86
4

flutter pub run build_runner build failed

18 Answers18

Successfully generating all *.g.dart files with:

Linked