Get error on flutter pub run build_runner build --delete-conflicting-outputs

[vadimlukutin]

Null check operator used on a null value
#0 PackageGraph.forPath. (package:build_runner_core/src/package_graph/package_graph.dart:110:72)
#1 MappedListIterable.elementAt (dart:_internal/iterable.dart:415:31)
#2 ListIterator.moveNext (dart:_internal/iterable.dart:344:26)
#3 List.addAll (dart:core-patch/growable_array.dart:325:17)
#4 PackageGraph.forPath (package:build_runner_core/src/package_graph/package_graph.dart:110:12)

#5 main (file:///home/un/.pub-cache/hosted/pub.dev/build_runner-2.4.6/bin/build_runner.dart:27:30)

[vadimlukutin]

helped run command

flutter gen-l10n

[jakemac53]

Can you try running a flutter pub get and then re-running the same command? I think your package config and pubspec might be out of sync.

[github-actions]

Without additional information we're not able to resolve this issue. Feel free to add more info or respond to any questions above and we can reopen the case. Thanks for your contribution!

[tayadepritam0]

hello my friend

try adding packages first
json_annotation
json_serializable
build_runner

click on pub get
then open terminal and run command
flutter pub run build_runner build --delete-conflicting-outputs