flutter运行命令后报错:RangeError: Value not in range: -1

[ZainCheung]

Unhandled exception:
RangeError: Value not in range: -1
#0 _StringBase.substring (dart:core-patch/string_patch.dart:399:7)
#1 _parsePackageLocations (package:build_runner_core/src/package_graph/package_graph.dart:162:21)
#2 new PackageGraph.forPath (package:build_runner_core/src/package_graph/package_graph.dart:67:30)
#3 new PackageGraph.forThisPackage (package:build_runner_core/src/package_graph/package_graph.dart:98:57)
#4 new BuildCommandRunner (package:build_runner/src/entrypoint/runner.dart:27:37)
#5 run (file:///D:/A%20Program%20Files/flutter/.pub-cache/hosted/pub.flutter-io.cn/json_model-0.0.2/bin/build_runner.dart:25:23)#6 main (file:///D:/A%20Program%20Files/flutter/.pub-cache/hosted/pub.flutter-io.cn/json_model-0.0.2/bin/json_model.dart:19:5)
#7 _delayEntrypointInvocation. (dart:isolate-patch/isolate_patch.dart:281:32)
#8 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:184:12)
pub finished with exit code 255

[KevinnZou]

我也遇到了同样的问题，你是windows吗？

[ZainCheung]

我也遇到了同样的问题，你是windows吗？

是的

[duyu648780240]

我也遇到了同样的问题，你是windows吗？

是的

我在mac上也遇到这个问题，请问解决了吗

[ZainCheung]

@KevinnZou @duyu648780240 我放弃了用命令自动生成，然后copy了一份官方给的案例文件：https://github.com/flutterchina/json_model/blob/master/example/lib/models/user.dart
以及.g.dart文件
https://github.com/flutterchina/json_model/blob/master/example/lib/models/user.g.dart
然后根据自己的需求改就好了

[NicolasHuangDF]

我也遇到了，而且连报错的每一个条目都一模一样，我怀疑是flutter sdk的问题

[Yechuanjie]

同样的问题，但是能生成对应dart model，不过生成的文件缺少xxx.g.dart

[Yechuanjie]

可以使用pub上的 json_to_model

[my-petrichor]

我也是 RangeError: Value not in range: -1 的问题，mac 电脑
@Yechuanjie 非常感谢，json_to_model 解决了我的问题