Json_serializable.dart: Generator cannot target libraries that have not been migrated to null-safety

[KalpShah412]

Hello,

In my Flutter project when i build g file of JsonSerializable using pub run build_runner build command,it gives the error of generator cannot target libraries that have not been migrated to null-safety.

Here is the version of package which i used:

flutter version - 2.12.0
dart version - 2.12.0
json_serializable : 4.0.2
json_annotation : 4.0.0
build_runner: ^1.11.5

[KalpShah412]

As I mentioned Dart Version is already 2.12.

[edsulaiman]

same problem here

````
environment:
sdk: ">=2.7.0 <3.0.0"

dependencies:
flutter:
sdk: flutter
flutter_hooks: ^0.16.0
hooks_riverpod: ^0.13.0
charts_flutter: ^0.9.0
http: ^0.12.2
darq: ^0.5.1
intl: ^0.16.1
cached_network_image: ^2.5.0
flutter_svg: ^0.19.1
json_annotation: ^4.0.0

# The following adds the Cupertino Icons font to your application.
# Use with the CupertinoIcons class for iOS style icons.
cupertino_icons: ^1.0.0

dev_dependencies:
flutter_test:
sdk: flutter
build_runner: ^1.11.5
json_serializable: ^4.0.2
Dart SDK version: 2.12.0 (stable) (Thu Feb 25 19:50:53 2021 +0100) on "windows_x64"````

[kevmoo]

You MUST set sdk: '>=2.12.0 <3.0.0'

The json_serializable and json_annotation ^4.0.0

On Sun, Mar 7, 2021 at 9:03 PM KalpShah412 [e-mail] wrote:

I got the one solution, You can use the dependency_overrides for now
until new release of build_runner version.

dependency_overrides:
json_annotation: ">=3.1.1"
json_serializable: ">=3.5.1"

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[surveshoeb]

You MUST set sdk: '>=2.12.0 <3.0.0' The json_serializable and json_annotation ^4.0.0
…
On Sun, Mar 7, 2021 at 9:03 PM KalpShah412 @.*> wrote: I got the one solution, You can use the dependency_overrides for now until new release of build_runner version. dependency_overrides: json_annotation: ">=3.1.1" json_serializable: ">=3.5.1" — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#823 (comment)>, or unsubscribe <github.com/notifications/unsubscribe-auth/AAAEFCTSI4EH2LKOG3LMJUTTCRLCXANCNFSM4YWV4Y4Q> .

@kevmoo it didn't work, I'm getting a similar error.

[kevmoo]

What's your pubspec Dart SDK constraint? Have you ran pub get or pub upgrade before running the builder?

[surveshoeb]

I have executed both pub command and my current SDK version is ">=2.12.0 <3.0.0"

[kevmoo]

You must change that to ">=2.12.0 <3.0.0"

If you don't have Dart 2.12, you need to get it!

On Mon, Mar 22, 2021 at 9:23 PM Shoeb Surve @.*>
wrote:

I have executed both pub command and my current SDK version is ">=2.7.0
<3.0.0"

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[surveshoeb]

I have updated my environment from 2.7.0 to 2.12.0 but still, error exists.

You must change that to ">=2.12.0 <3.0.0" If you don't have Dart 2.12, you need to get it!
…
On Mon, Mar 22, 2021 at 9:23 PM Shoeb Surve ***@***.***> wrote: I have executed both pub command and my current SDK version is ">=2.7.0 <3.0.0" — You are receiving this because you modified the open/close state. Reply to this email directly, view it on GitHub <#823 (comment)>, or unsubscribe <github.com/notifications/unsubscribe-auth/AAAEFCSRZEU7FRZVKGCBWUDTFAJUHANCNFSM4YWV4Y4Q> .

[kevmoo]

would you paste the full error here?

[surveshoeb]

Error

Generator cannot target libraries that have not been migrated to null-safety.
package:my_package/datamodels/user_data.dart:12:7
   ╷
12 │ class UserData {
   │       ^^^^^^^^
   ╵
[SEVERE] json_serializable:json_serializable on lib/app/locator.config.dart:

[rickydj]

Hi, i have the same problem here, even when i update my SDK to 2.12, what could i do with it?

[KalpShah412]

Hi, i have the same problem here, even when i update my SDK to 2.12, what could i do with it?

Hey, please upgrade your json packages like,

  sdk: '>=2.12.0 <3.0.0'

  json_annotation: ^4.0.1
  json_serializable: ^4.1.0

  build_runner: ^1.12.2

After upgrade the packages to run this command:

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

[exeptionerror]

[Solved] Generator cannot target libraries that have not been migrated to null-safety

[ttmdung203]

You MUST set sdk: '>=2.12.0 <3.0.0' The json_serializable and json_annotation ^4.0.0
…

Great. You saved my life :)