我认为我以某种方式破坏了我的安装。尽管我没有想到与此相关的任何操作，但是在此文件中突然出现了许多编译错误。
ios/.symlinks/flutter/common/flutter_patched_sdk/stub_ui/window.dart
有34个未定义的类错误。像此文件一样，它丢失了一些参考。我该如何修理？
error: Undefined class 'PointerDataPacket'. (undefined_class at [liga] ios/.symlinks/flutter/common/flutter_patched_sdk/stub_ui/window.dart:14)
error: Undefined class 'ByteData'. (undefined_class at [liga] ios/.symlinks/flutter/common/flutter_patched_sdk/stub_ui/window.dart:17)
error: Undefined class 'SemanticsAction'. (undefined_class at [liga] ios/.symlinks/flutter/common/flutter_patched_sdk/stub_ui/window.dart:17)
error: Undefined class 'ByteData'. (undefined_class at [liga] ios/.symlinks/flutter/common/flutter_patched_sdk/stub_ui/window.dart:23)
error: Undefined class 'ByteData'. (undefined_class at [liga] ios/.symlinks/flutter/common/flutter_patched_sdk/stub_ui/window.dart:26)
error: The method 'hashValues' isn't defined for the class 'Locale'. (undefined_method at [liga] ios/.symlinks/flutter/common/flutter_patched_sdk/stub_ui/window.dart:378)
error: Undefined class 'Size'. (undefined_class at [liga] ios/.symlinks/flutter/common/flutter_patched_sdk/stub_ui/window.dart:441)
error: Undefined class 'Size'. (undefined_class at [liga] ios/.symlinks/flutter/common/flutter_patched_sdk/stub_ui/window.dart:442)
error: Undefined name 'Size'. (undefined_identifier at [liga] ios/.symlinks/flutter/common/flutter_patched_sdk/stub_ui/window.dart:442)
error: Undefined class 'Zone'. (undefined_class at [liga] ios/.symlinks/flutter/common/flutter_patched_sdk/stub_ui/window.dart:497)
error: Undefined name 'Zone'. (undefined_identifier at [liga] ios/.symlinks/flutter/common/flutter_patched_sdk/stub_ui/window.dart:500)
error: Undefined class 'Zone'. (undefined_class at [liga] ios/.symlinks/flutter/common/flutter_patched_sdk/stub_ui/window.dart:548)
error: Undefined name 'Zone'. (undefined_identifier at [liga] ios/.symlinks/flutter/common/flutter_patched_sdk/stub_ui/window.dart:551)
error: Undefined class 'Zone'. (undefined_class at [liga] ios/.symlinks/flutter/common/flutter_patched_sdk/stub_ui/window.dart:570)
error: Undefined name 'Zone'. (undefined_identifier at [liga] ios/.symlinks/flutter/common/flutter_patched_sdk/stub_ui/window.dart:573)
error: Undefined class 'Zone'. (undefined_class at [liga] ios/.symlinks/flutter/common/flutter_patched_sdk/stub_ui/window.dart:609)
error: Undefined name 'Zone'. (undefined_identifier at [liga] ios/.symlinks/flutter/common/flutter_patched_sdk/stub_ui/window.dart:612)
error: Undefined class 'Zone'. (undefined_class at [liga] ios/.symlinks/flutter/common/flutter_patched_sdk/stub_ui/window.dart:636)
error: Undefined name 'Zone'. (undefined_identifier at [liga] ios/.symlinks/flutter/common/flutter_patched_sdk/stub_ui/window.dart:639)
error: Undefined class 'Zone'. (undefined_class at [liga] ios/.symlinks/flutter/common/flutter_patched_sdk/stub_ui/window.dart:658)
error: Undefined name 'Zone'. (undefined_identifier at [liga] ios/.symlinks/flutter/common/flutter_patched_sdk/stub_ui/window.dart:661)
error: Undefined class 'Zone'. (undefined_class at [liga] ios/.symlinks/flutter/common/flutter_patched_sdk/stub_ui/window.dart:675)
error: Undefined name 'Zone'. (undefined_identifier at [liga] ios/.symlinks/flutter/common/flutter_patched_sdk/stub_ui/window.dart:678)
error: Undefined class 'Scene'. (undefined_class at [liga] ios/.symlinks/flutter/common/flutter_patched_sdk/stub_ui/window.dart:750)
error: Undefined class 'Zone'. (undefined_class at [liga] ios/.symlinks/flutter/common/flutter_patched_sdk/stub_ui/window.dart:768)
error: Undefined name 'Zone'. (undefined_identifier at [liga] ios/.symlinks/flutter/common/flutter_patched_sdk/stub_ui/window.dart:771)
error: Undefined class 'Zone'. (undefined_class at [liga] ios/.symlinks/flutter/common/flutter_patched_sdk/stub_ui/window.dart:784)
error: Undefined name 'Zone'. (undefined_identifier at [liga] ios/.symlinks/flutter/common/flutter_patched_sdk/stub_ui/window.dart:787)
error: Undefined class 'Zone'. (undefined_class at [liga] ios/.symlinks/flutter/common/flutter_patched_sdk/stub_ui/window.dart:800)
error: Undefined name 'Zone'. (undefined_identifier at [liga] ios/.symlinks/flutter/common/flutter_patched_sdk/stub_ui/window.dart:803)
error: Undefined class 'SemanticsUpdate'. (undefined_class at [liga] ios/.symlinks/flutter/common/flutter_patched_sdk/stub_ui/window.dart:813)
error: Undefined class 'ByteData'. (undefined_class at [liga] ios/.symlinks/flutter/common/flutter_patched_sdk/stub_ui/window.dart:839)
error: Undefined class 'Zone'. (undefined_class at [liga] ios/.symlinks/flutter/common/flutter_patched_sdk/stub_ui/window.dart:859)
error: Undefined name 'Zone'. (undefined_identifier at [liga] ios/.symlinks/flutter/common/flutter_patched_sdk/stub_ui/window.dart:862)
flutter doctor的输出-v
• Flutter version 1.2.1 at /Users/darrelldavis/Development/Flutter/flutter
• Framework revision 8661d8aecd (3 months ago), 2019-02-14 19:19:53 -0800
• Engine revision 3757390fa4
• Dart version 2.1.2 (build 2.1.2-dev.0.0 0a7dcf17eb)
[✓] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
• Android SDK at /Users/darrelldavis/Library/Android/sdk
• Android NDK location not configured (optional; useful for native profiling support)
• Platform android-28, build-tools 28.0.3
• Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1343-b01)
• All Android licenses accepted.
[✓] iOS toolchain - develop for iOS devices (Xcode 10.2.1)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 10.2.1, Build version 10E1001
• ios-deploy 1.9.4
• CocoaPods version 1.6.1
[✓] Android Studio (version 3.4)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin version 35.0.1
• Dart plugin version 183.6270
• Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1343-b01)
[✓] VS Code (version 1.33.1)
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 2.26.0
[✓] Connected device (1 available)
• iPhone Xʀ • 346FC64F-6915-41C3-98BF-3C3A86E55AAB • ios • com.apple.CoreSimulator.SimRuntime.iOS-12-2 (simulator)
• No issues found!
Output from flutter analyze
Analyzing liga... ⣽
info • This class (or a class which this class inherits from) is marked as '@immutable', but one or more of its instance fields are not final: MyApp._userModel •
lib/app.dart:10:7 • must_be_immutable
info • This class (or a class which this class inherits from) is marked as '@immutable', but one or more of its instance fields are not final: PinEntryPage._pin •
lib/pages/pin_entry_page.dart:4:7 • must_be_immutable
2 issues found. (ran in 4.0s)