flutter packages pub run build_runner build failed to generate xxx.g.part file to parse json.

[sinojelly]

• Dart SDK Version (dart --version)

dart --version
Dart VM version: 2.9.0-14.1.beta (beta) (Tue Jun 9 10:52:57 2020 +0200) on "windows_x64"

• What package(s) from this repo you are using, and the version (i.e. build_runner 0.7.12)

  • If you are not sure, try checking your pubspec.lock file.
    build_runner:
    dependency: "direct dev"
    description:
    name: build_runner
    url: "https://pub.flutter-io.cn"
    source: hosted
    version: "1.10.0"
    build_runner_core:
    dependency: transitive
    description:
    name: build_runner_core
    url: "https://pub.flutter-io.cn"
    source: hosted
    version: "5.2.0"

• What builder(s) you are using (or writing yourself). Try to give a short summary of what they do.

• Use Windows

d>flutter packages pub run build_runner build
[INFO] Generating build script...
[INFO] Generating build script completed, took 382ms

You have hit a bug in build_runner
Please file an issue with reproduction steps at https://github.com/dart-lang/build/issues

NoSuchMethodError: Closure call with mismatched arguments: function 'MutablePackageTree.allPackages'
Receiver: Closure: (_SyncIterator) => bool
Tried calling: MutablePackageTree.allPackages()
Found: MutablePackageTree.allPackages(_SyncIterator) => bool
dart:core _SyncIterable.iterator
package:package_config/src/package_config_impl.dart 26:36 new SimplePackageConfig
package:package_config/src/package_config_json.dart 213:10 parsePackageConfigJson
package:package_config/src/package_config_json.dart 45:10 parsePackageConfigBytes
package:package_config/src/package_config_io.dart 117:10 readPackageConfigJsonFile
package:package_config/src/discovery.dart 109:18 findPackagConfigInDirectory
package:package_config/src/discovery.dart 44:31 findPackageConfig
package:package_config/package_config.dart 114:5 findPackageConfig
package:build_runner_core/src/package_graph/package_graph.dart 74:15 PackageGraph.forPath
package:build_runner_core/src/package_graph/package_graph.dart 110:20 PackageGraph.forThisPackage
package:build_runner/src/entrypoint/run.dart 22:64 run
.dart_tool\build\entrypoint\build.dart 22:22 main

pub finished with exit code 1

If I switch to flutter stable channel, it shows the following error:

d>flutter --version
Flutter 1.17.5 • channel stable • https://github.com/flutter/flutter.git
Framework • revision 8af6b2f038 (2 weeks ago) • 2020-06-30 12:53:55 -0700
Engine • revision ee76268252
Tools • Dart 2.8.4

d>flutter packages pub run build_runner build
[INFO] Generating build script...
Unhandled exception:
NoSuchMethodError: The getter 'name' was called on null.
Receiver: null
Tried calling: name
#0 Object.noSuchMethod (dart:core-patch/object_patch.dart:53:5)
#1 _findBuilderApplications. (package:build_runner/src/build_script_generate/build_script_generate.dart:63:24)
#2 _CustomHashMap.[]= (dart:collection-patch/collection_patch.dart:278:31)
#3 stronglyConnectedComponents.strongConnect (package:graphs/src/strongly_connected_components.dart:49:12)
#4 stronglyConnectedComponents.strongConnect (package:graphs/src/strongly_connected_components.dart:57:22)
#5 stronglyConnectedComponents.strongConnect (package:graphs/src/strongly_connected_components.dart:57:22)
#6 stronglyConnectedComponents (package:graphs/src/strongly_connected_components.dart:76:50)
#7 _findBuilderApplications (package:build_runner/src/build_script_generate/build_script_generate.dart:59:27)

#8 _generateBuildScript (package:build_runner/src/build_script_generate/build_script_generate.dart:28:26)
#9 logTimedAsync (package:build_runner_core/src/logging/logging.dart:25:30)
#10 generateBuildScript (package:build_runner/src/build_script_generate/build_script_generate.dart:25:5)
#11 generateAndRun (package:build_runner/src/build_script_generate/bootstrap.dart:49:31)

#12 main (file:///C:/Users/jelly/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/build_runner-1.10.0/bin/build_runner.dart:87:30)

#13 _startIsolate. (dart:isolate-patch/isolate_patch.dart:299:32)
#14 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:168:12)
pub finished with exit code 255

[jakemac53]

This is caused by dart-lang/sdk#41802

You will need to delete your .dart_tool directory to resolve it.

[jakemac53]

(or I think you can do a flutter clean)