首页 > 解决方案 > Flutter:pub 以退出代码 255 结束

问题描述

我正在通过构建运行器、json 模型和 json 可序列化为我的颤振应用程序制作模型。但我得到了这个错误

Unhandled exception:
RangeError (index): Invalid value: Valid value range is empty: 0
#0      _StringBase.[] (dart:core-patch/string_patch.dart:247:55)
#1      changeFirstChar (file:///C:/flutter/.pub-cache/hosted/pub.dartlang.org/json_model-0.0.2/bin/json_model.dart:89:41)
#2      getType (file:///C:/flutter/.pub-cache/hosted/pub.dartlang.org/json_model-0.0.2/bin/json_model.dart:116:20)
#3      walk.<anonymous closure>.<anonymous closure> (file:///C:/flutter/.pub-cache/hosted/pub.dartlang.org/json_model-0.0.2/bin/json_model.dart:62:23)
#4      _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:379:8)
#5      walk.<anonymous closure> (file:///C:/flutter/.pub-cache/hosted/pub.dartlang.org/json_model-0.0.2/bin/json_model.dart:50:37)
#6      List.forEach (dart:core-patch/growable_array.dart:282:8)
#7      walk (file:///C:/flutter/.pub-cache/hosted/pub.dartlang.org/json_model-0.0.2/bin/json_model.dart:38:8)
#8      main (file:///C:/flutter/.pub-cache/hosted/pub.dartlang.org/json_model-0.0.2/bin/json_model.dart:18:6)
#9      _startIsolate.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:299:32)
#10     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:168:12)
pub finished with exit code 255

在我的 pubspec.yaml 文件中,我在开发依赖项中添加了这些颤振包:

dev_dependencies:
  flutter_test:
    sdk: flutter
  json_model: ^0.0.2
  json_serializable:
  build_runner:

我要为其制作模型的 Json 文件:

第一个 json 文件

{
  "id": 1,
  "country": "Australia",
  "currencySymbol": "$"
}

第二个 Json 文件

{
  "currencylist": "$[]currency"
}

你能帮我在哪里做错了吗,为什么当我在终端 颤振包 pub run json_model中运行命令时会出现这个错误。

标签: flutterserializationmodeldart-pubjsonmodel

解决方案


这为时已晚,但有人可能会使用它,这对我有用:

我认为当您更改模型中的某些内容并再次运行时,这可能会发生

flutter pub run build_runner build

更新:

运行它,它会为你完成这项工作:

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

old :所以首先尝试删除所有生成的以结尾的文件

XXX.g.dart

并运行

flutter clean 

然后

flutter pub get

最后

flutter pub run build_runner build

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