编译过程中报错

**【任务描述】**
flutter build hap --target-platform ohos-arm64 --debug true --local-engine=/Users/zhaohongtu/work/engine/src/out/ohos_debug_unopt_arm64

start hap build...
check platform environment
current platform environment PUB_HOSTED_URL = https://pub.flutter-io.cn
current platform environment FLUTTER_STORAGE_BASE_URL = https://storage.flutter-io.cn
current platform environment OHPM_HOME = /Users/zhaohongtu/ohos/command-line-tools/ohpm
Compiling debug_ohos_application for the Ohos...                 1,342ms
start copy flutter assets to project
copy directory from /Users/zhaohongtu/Desktop/myapp/build/ohos/flutter_assets to /Users/zhaohongtu/Desktop/myapp/ohos/entry/src/main/resources/rawfile/flutter_assets

Failed to send crash report due to a network error: Operation timed out
Oops; flutter has exited unexpectedly: "type 'Null' is not a subtype of type 'String' in type cast".
A crash report has been written to /Users/zhaohongtu/Desktop/myapp/flutter_01.log.

flutter build hap --target-platform ohos-arm64 --debug true --local-engine=/Users/zhaohongtu/work/engine/src/out/ohos_debug_unopt_arm64

## exception

_CastError: type 'Null' is not a subtype of type 'String' in type cast

```
#0      getApiVersion (package:flutter_tools/src/ohos/application_package.dart:113:69)
#1      OhosBuildData.parseOhosBuildData (package:flutter_tools/src/ohos/application_package.dart:102:20)
#2      buildHap (package:flutter_tools/src/ohos/build_hap.dart:266:21)
<asynchronous suspension>
#3      BuildHapCommand.runCommand (package:flutter_tools/src/commands/build_hap.dart:47:5)
<asynchronous suspension>
#4      FlutterCommand.run.<anonymous closure> (package:flutter_tools/src/runner/flutter_command.dart:1257:27)
<asynchronous suspension>
#5      AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:150:19)
<asynchronous suspension>
#6      CommandRunner.runCommand (package:args/command_runner.dart:209:13)
<asynchronous suspension>
#7      FlutterCommandRunner.runCommand.<anonymous closure> (package:flutter_tools/src/runner/flutter_command_runner.dart:283:9)
<asynchronous suspension>
#8      AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:150:19)
<asynchronous suspension>
#9      FlutterCommandRunner.runCommand (package:flutter_tools/src/runner/flutter_command_runner.dart:229:5)
<asynchronous suspension>
#10     run.<anonymous closure>.<anonymous closure> (package:flutter_tools/runner.dart:64:9)
<asynchronous suspension>
#11     AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:150:19)
<asynchronous suspension>
#12     main (package:flutter_tools/executable.dart:91:3)
<asynchronous suspension>
```
## flutter doctor

```
[33m[!][39m Flutter (Channel master, 3.7.12, on macOS 13.6 22G120 darwin-x64, locale zh-Hans-CN)
    [32m•[39m Flutter version 3.7.12 on channel master at /Users/zhaohongtu/ohos/flutter_flutter
    [33m![39m Upstream repository https://gitee.com/openharmony-sig/flutter_flutter.git is not a standard remote.
      Set environment variable "FLUTTER_GIT_URL" to https://gitee.com/openharmony-sig/flutter_flutter.git to dismiss this error.
    [32m•[39m Framework revision 14b5de75a4 (31 hours ago), 2023-10-25 01:04:25 +0000
    [32m•[39m Engine revision 1a65d409c7
    [32m•[39m Dart version 2.19.6
    [32m•[39m DevTools version 2.20.1
    [32m•[39m Pub download mirror https://pub.flutter-io.cn
    [32m•[39m Flutter download mirror https://storage.flutter-io.cn
    [32m•[39m If those were intentional, you can disregard the above warnings; however it is recommended to use "git" directly to perform update checks and upgrades.

[32m[✓][39m OpenHarmony toolchain - develop for OpenHarmony devices
    [32m•[39m OpenHarmony Sdk location: /Users/zhaohongtu/env/sdk/openharmony, available api versions has [9, 10]
    [32m•[39m hdc version 1.3.0
    [32m•[39m ohpm version 1.2.0
    [32m•[39m signTool location:/Users/zhaohongtu/ohos/developtools_hapsigner/autosign

[32m[✓][39m Android toolchain - develop for Android devices (Android SDK version 34.0.0)
    [32m•[39m Android SDK at /Users/zhaohongtu/Library/Android/sdk
    [32m•[39m Platform android-34, build-tools 34.0.0
    [32m•[39m Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    [32m•[39m Java version OpenJDK Runtime Environment (build 11.0.8+10-b944.6916264)
    [32m•[39m All Android licenses accepted.

[32m[✓][39m Xcode - develop for iOS and macOS (Xcode 15.0.1)
    [32m•[39m Xcode at /Applications/Xcode.app/Contents/Developer
    [32m•[39m Build 15A507
    [32m•[39m CocoaPods version 1.13.0

[32m[✓][39m Chrome - develop for the web
    [32m•[39m Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[32m[✓][39m Android Studio (version 4.2)
    [32m•[39m Android Studio at /Applications/Android Studio.app/Contents
    [32m•[39m Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    [32m•[39m Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    [32m•[39m Java version OpenJDK Runtime Environment (build 11.0.8+10-b944.6916264)

[32m[✓][39m VS Code (version 1.83.1)
    [32m•[39m VS Code at /Applications/Visual Studio Code.app/Contents
    [32m•[39m Flutter extension can be installed from:
      🔨 https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter

[32m[✓][39m Connected device (3 available)
    [32m•[39m RTE AL00 (mobile) • 127.0.0.1:18888 • android-arm64  • Android 12 (API 31)
    [32m•[39m macOS (desktop)   • macos           • darwin-x64     • macOS 13.6 22G120 darwin-x64
    [32m•[39m Chrome (web)      • chrome          • web-javascript • Google Chrome 118.0.5993.96

[32m[✓][39m HTTP Host Availability
    [32m•[39m All required HTTP hosts are available

[33m![39m Doctor found issues in 1 category.
```

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