Flutter Channel渠道，更新Flutter SDK

flutter  --version  列出所有版本

flutter channel 列出当前所有渠道稳定版，开发版等  和目前所在的渠道版本

master           为当前最新的channel；

dev                为当前最新且充分测试后的channel；

beta              为每月Flutter官方调整选出来的最好的dev的channel；

stable            为当前最稳定的channel。

稳定性排序：master < dev < beta < stable 

更新Flutter SDK

在命令行中运行命令：“flutter upgrade --force”。 

有的小伙伴用“flutter upgrade” 可能会报错。所以这里推荐用强制更新。

耐心等待大约10分钟，当出现下面界面的时候，说明更新完了。

更新后，运行项目，很奇怪报了错误信息，错误信息如下：

Running Gradle task 'assembleDebug'...

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/path_provider_windows-0.0.4+3/lib/src/path_provider_windows_real.dart:126:25: Error: The getter 'addressOf' isn't defined for the class 'GUID'.

- 'GUID' is from 'package:win32/src/structs.dart' ('../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart').

Try correcting the name to the name of an existing getter, or defining a getter or field named 'addressOf'.

          knownFolderID.addressOf, KF_FLAG_DEFAULT, NULL, pathPtrPtr);

                        ^^^^^^^^^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart:1067:7: Error: The getter 'addressOf' isn't defined for the class 'LOGFONT'.

- 'LOGFONT' is from 'package:win32/src/structs.dart' ('../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart').

Try correcting the name to the name of an existing getter, or defining a getter or field named 'addressOf'.

      addressOf.cast<Uint8>().elementAt(28).cast<Utf16>();

      ^^^^^^^^^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart:1112:29: Error: The getter 'addressOf' isn't defined for the class 'ENUMLOGFONTEX'.

- 'ENUMLOGFONTEX' is from 'package:win32/src/structs.dart' ('../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart').

Try correcting the name to the name of an existing getter, or defining a getter or field named 'addressOf'.

  LOGFONT get elfLogFont => addressOf.cast<LOGFONT>().ref;

                            ^^^^^^^^^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart:1114:29: Error: The getter 'addressOf' isn't defined for the class 'ENUMLOGFONTEX'.

- 'ENUMLOGFONTEX' is from 'package:win32/src/structs.dart' ('../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart').

Try correcting the name to the name of an existing getter, or defining a getter or field named 'addressOf'.

  String get elfFullName => addressOf

                            ^^^^^^^^^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart:1120:26: Error: The getter 'addressOf' isn't defined for the class 'ENUMLOGFONTEX'.

- 'ENUMLOGFONTEX' is from 'package:win32/src/structs.dart' ('../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart').

Try correcting the name to the name of an existing getter, or defining a getter or field named 'addressOf'.

  String get elfStyle => addressOf

                        ^^^^^^^^^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart:1126:27: Error: The getter 'addressOf' isn't defined for the class 'ENUMLOGFONTEX'.

- 'ENUMLOGFONTEX' is from 'package:win32/src/structs.dart' ('../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart').

Try correcting the name to the name of an existing getter, or defining a getter or field named 'addressOf'.

  String get elfScript => addressOf

                          ^^^^^^^^^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart:2688:7: Error: The getter 'addressOf' isn't defined for the class 'OSVERSIONINFO'.

- 'OSVERSIONINFO' is from 'package:win32/src/structs.dart' ('../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart').

Try correcting the name to the name of an existing getter, or defining a getter or field named 'addressOf'.

      addressOf.cast<Uint8>().elementAt(20).cast<Utf16>().unpackString(128);

      ^^^^^^^^^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart:2699:11: Error: The getter 'addressOf' isn't defined for the class 'OSVERSIONINFO'.

- 'OSVERSIONINFO' is from 'package:win32/src/structs.dart' ('../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart').

Try correcting the name to the name of an existing getter, or defining a getter or field named 'addressOf'.

        ..addressOf.cast<Uint8>().elementAt(20).value = 0;

          ^^^^^^^^^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart:2744:24: Error: The getter 'addressOf' isn't defined for the class 'BLUETOOTH_DEVICE_INFO'.

- 'BLUETOOTH_DEVICE_INFO' is from 'package:win32/src/structs.dart' ('../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart').

Try correcting the name to the name of an existing getter, or defining a getter or field named 'addressOf'.

  String get szName => addressOf

                      ^^^^^^^^^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart:2837:7: Error: The getter 'addressOf' isn't defined for the class 'BLUETOOTH_PIN_INFO'.

- 'BLUETOOTH_PIN_INFO' is from 'package:win32/src/structs.dart' ('../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart').

Try correcting the name to the name of an existing getter, or defining a getter or field named 'addressOf'.

      addressOf.cast<Uint8>().elementAt(BTH_MAX_PIN_SIZE).value;

      ^^^^^^^^^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart:2840:5: Error: The getter 'addressOf' isn't defined for the class 'BLUETOOTH_PIN_INFO'.

- 'BLUETOOTH_PIN_INFO' is from 'package:win32/src/structs.dart' ('../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart').

Try correcting the name to the name of an existing getter, or defining a getter or field named 'addressOf'.

    addressOf.cast<Uint8>().elementAt(BTH_MAX_PIN_SIZE).value =

    ^^^^^^^^^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart:2845:28: Error: The getter 'addressOf' isn't defined for the class 'BLUETOOTH_PIN_INFO'.

- 'BLUETOOTH_PIN_INFO' is from 'package:win32/src/structs.dart' ('../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart').

Try correcting the name to the name of an existing getter, or defining a getter or field named 'addressOf'.

      String.fromCharCodes(addressOf.cast<Uint8>().asTypedList(pinLength));

                          ^^^^^^^^^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart:2853:7: Error: The getter 'addressOf' isn't defined for the class 'BLUETOOTH_PIN_INFO'.

- 'BLUETOOTH_PIN_INFO' is from 'package:win32/src/structs.dart' ('../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart').

Try correcting the name to the name of an existing getter, or defining a getter or field named 'addressOf'.

      addressOf.cast<Uint8>().elementAt(idx).value = pinData[idx];

      ^^^^^^^^^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/com/combase.dart:38:31: Error: The getter 'addressOf' isn't defined for the class 'GUID'.

- 'GUID' is from 'package:win32/src/structs.dart' ('../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart').

Try correcting the name to the name of an existing getter, or defining a getter or field named 'addressOf'.

  final iid = GUID.allocate().addressOf;

                              ^^^^^^^^^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/com/combase.dart:56:33: Error: The getter 'addressOf' isn't defined for the class 'GUID'.

- 'GUID' is from 'package:win32/src/structs.dart' ('../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart').

Try correcting the name to the name of an existing getter, or defining a getter or field named 'addressOf'.

  final clsid = GUID.allocate().addressOf;

                                ^^^^^^^^^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/winrt/winrt_helpers.dart:86:40: Error: The getter 'addressOf' isn't defined for the class 'GUID'.

- 'GUID' is from 'package:win32/src/structs.dart' ('../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart').

Try correcting the name to the name of an existing getter, or defining a getter or field named 'addressOf'.

  final riidCalendar = GUID.allocate().addressOf;

                                      ^^^^^^^^^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/generated/IDesktopWallpaper.dart:197:38: Error: The getter 'addressOf' isn't defined for the class 'COMObject'.

- 'COMObject' is from 'package:win32/src/com/combase.dart' ('../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/com/combase.dart').

Try correcting the name to the name of an existing getter, or defining a getter or field named 'addressOf'.

    final ptr = COMObject.allocate().addressOf;

                                    ^^^^^^^^^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/generated/IDesktopWallpaper.dart:200:49: Error: The getter 'addressOf' isn't defined for the class 'GUID'.

- 'GUID' is from 'package:win32/src/structs.dart' ('../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart').

Try correcting the name to the name of an existing getter, or defining a getter or field named 'addressOf'.

        GUID.fromString(CLSID_DesktopWallpaper).addressOf,

                                                ^^^^^^^^^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/generated/IDesktopWallpaper.dart:203:48: Error: The getter 'addressOf' isn't defined for the class 'GUID'.

- 'GUID' is from 'package:win32/src/structs.dart' ('../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart').

Try correcting the name to the name of an existing getter, or defining a getter or field named 'addressOf'.

        GUID.fromString(IID_IDesktopWallpaper).addressOf,

                                              ^^^^^^^^^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/generated/IFileOpenDialog.dart:58:38: Error: The getter 'addressOf' isn't defined for the class 'COMObject'.

- 'COMObject' is from 'package:win32/src/com/combase.dart' ('../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/com/combase.dart').

Try correcting the name to the name of an existing getter, or defining a getter or field named 'addressOf'.

    final ptr = COMObject.allocate().addressOf;

                                    ^^^^^^^^^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/generated/IFileOpenDialog.dart:61:47: Error: The getter 'addressOf' isn't defined for the class 'GUID'.

- 'GUID' is from 'package:win32/src/structs.dart' ('../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart').

Try correcting the name to the name of an existing getter, or defining a getter or field named 'addressOf'.

        GUID.fromString(CLSID_FileOpenDialog).addressOf,

                                              ^^^^^^^^^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/generated/IFileOpenDialog.dart:64:46: Error: The getter 'addressOf' isn't defined for the class 'GUID'.

- 'GUID' is from 'package:win32/src/structs.dart' ('../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart').

Try correcting the name to the name of an existing getter, or defining a getter or field named 'addressOf'.

        GUID.fromString(IID_IFileOpenDialog).addressOf,

                                            ^^^^^^^^^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/generated/IFileSaveDialog.dart:99:38: Error: The getter 'addressOf' isn't defined for the class 'COMObject'.

- 'COMObject' is from 'package:win32/src/com/combase.dart' ('../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/com/combase.dart').

Try correcting the name to the name of an existing getter, or defining a getter or field named 'addressOf'.

    final ptr = COMObject.allocate().addressOf;

                                    ^^^^^^^^^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/generated/IFileSaveDialog.dart:102:47: Error: The getter 'addressOf' isn't defined for the class 'GUID'.

- 'GUID' is from 'package:win32/src/structs.dart' ('../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart').

Try correcting the name to the name of an existing getter, or defining a getter or field named 'addressOf'.

        GUID.fromString(CLSID_FileSaveDialog).addressOf,

                                              ^^^^^^^^^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/generated/IFileSaveDialog.dart:105:46: Error: The getter 'addressOf' isn't defined for the class 'GUID'.

- 'GUID' is from 'package:win32/src/structs.dart' ('../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart').

Try correcting the name to the name of an existing getter, or defining a getter or field named 'addressOf'.

        GUID.fromString(IID_IFileSaveDialog).addressOf,

                                            ^^^^^^^^^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/generated/IKnownFolderManager.dart:164:38: Error: The getter 'addressOf' isn't defined for the class 'COMObject'.

- 'COMObject' is from 'package:win32/src/com/combase.dart' ('../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/com/combase.dart').

Try correcting the name to the name of an existing getter, or defining a getter or field named 'addressOf'.

    final ptr = COMObject.allocate().addressOf;

                                    ^^^^^^^^^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/generated/IKnownFolderManager.dart:167:51: Error: The getter 'addressOf' isn't defined for the class 'GUID'.

- 'GUID' is from 'package:win32/src/structs.dart' ('../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart').

Try correcting the name to the name of an existing getter, or defining a getter or field named 'addressOf'.

        GUID.fromString(CLSID_KnownFolderManager).addressOf,

                                                  ^^^^^^^^^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/generated/IKnownFolderManager.dart:170:50: Error: The getter 'addressOf' isn't defined for the class 'GUID'.

- 'GUID' is from 'package:win32/src/structs.dart' ('../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart').

Try correcting the name to the name of an existing getter, or defining a getter or field named 'addressOf'.

        GUID.fromString(IID_IKnownFolderManager).addressOf,

                                                ^^^^^^^^^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/generated/INetworkListManager.dart:128:38: Error: The getter 'addressOf' isn't defined for the class 'COMObject'.

- 'COMObject' is from 'package:win32/src/com/combase.dart' ('../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/com/combase.dart').

Try correcting the name to the name of an existing getter, or defining a getter or field named 'addressOf'.

    final ptr = COMObject.allocate().addressOf;

                                    ^^^^^^^^^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/generated/INetworkListManager.dart:131:51: Error: The getter 'addressOf' isn't defined for the class 'GUID'.

- 'GUID' is from 'package:win32/src/structs.dart' ('../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart').

Try correcting the name to the name of an existing getter, or defining a getter or field named 'addressOf'.

        GUID.fromString(CLSID_NetworkListManager).addressOf,

                                                  ^^^^^^^^^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/generated/INetworkListManager.dart:134:50: Error: The getter 'addressOf' isn't defined for the class 'GUID'.

- 'GUID' is from 'package:win32/src/structs.dart' ('../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart').

Try correcting the name to the name of an existing getter, or defining a getter or field named 'addressOf'.

        GUID.fromString(IID_INetworkListManager).addressOf,

                                                ^^^^^^^^^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/generated/IWbemLocator.dart:82:38: Error: The getter 'addressOf' isn't defined for the class 'COMObject'.

- 'COMObject' is from 'package:win32/src/com/combase.dart' ('../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/com/combase.dart').

Try correcting the name to the name of an existing getter, or defining a getter or field named 'addressOf'.

    final ptr = COMObject.allocate().addressOf;

                                    ^^^^^^^^^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/generated/IWbemLocator.dart:84:68: Error: The getter 'addressOf' isn't defined for the class 'GUID'.

- 'GUID' is from 'package:win32/src/structs.dart' ('../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart').

Try correcting the name to the name of an existing getter, or defining a getter or field named 'addressOf'.

    final hr = CoCreateInstance(GUID.fromString(CLSID_WbemLocator).addressOf,

                                                                  ^^^^^^^^^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/generated/IWbemLocator.dart:85:64: Error: The getter 'addressOf' isn't defined for the class 'GUID'.

- 'GUID' is from 'package:win32/src/structs.dart' ('../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart').

Try correcting the name to the name of an existing getter, or defining a getter or field named 'addressOf'.

        nullptr, CLSCTX_ALL, GUID.fromString(IID_IWbemLocator).addressOf, ptr);

                                                              ^^^^^^^^^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/ffi-0.1.3/lib/src/utf8.dart:63:33: Error: The getter 'addressOf' isn't defined for the class 'Utf8'.

- 'Utf8' is from 'package:ffi/src/utf8.dart' ('../../../../../../.pub-cache/hosted/pub.flutter-io.cn/ffi-0.1.3/lib/src/utf8.dart').

Try correcting the name to the name of an existing getter, or defining a getter or field named 'addressOf'.

  String toString() => fromUtf8(addressOf);

                                ^^^^^^^^^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart:1111:7: Error: Struct 'ENUMLOGFONTEX' is empty. Empty structs are undefined behavior.

class ENUMLOGFONTEX extends Struct {

      ^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart:2835:7: Error: Struct 'BLUETOOTH_PIN_INFO' is empty. Empty structs are undefined behavior.

class BLUETOOTH_PIN_INFO extends Struct {

      ^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart:2960:7: Error: Struct 'EXCEPINFO' is empty. Empty structs are undefined behavior.

class EXCEPINFO extends Struct {}

      ^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart:2966:7: Error: Struct 'PROPERTYKEY' is empty. Empty structs are undefined behavior.

class PROPERTYKEY extends Struct {}

      ^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart:2973:7: Error: Struct 'PROPVARIANT' is empty. Empty structs are undefined behavior.

class PROPVARIANT extends Struct {}

      ^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart:2978:7: Error: Struct 'SAFEARRAY' is empty. Empty structs are undefined behavior.

class SAFEARRAY extends Struct {}

      ^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart:2985:7: Error: Struct 'CLSID' is empty. Empty structs are undefined behavior.

class CLSID extends Struct {}

      ^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart:2992:7: Error: Struct 'STATSTG' is empty. Empty structs are undefined behavior.

class STATSTG extends Struct {}

      ^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/win32-1.7.4+1/lib/src/structs.dart:2999:7: Error: Struct 'NLM_SIMULATED_PROFILE_INFO' is empty. Empty structs are undefined behavior.

class NLM_SIMULATED_PROFILE_INFO extends Struct {}

      ^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/ffi-0.1.3/lib/src/utf8.dart:23:7: Error: Struct 'Utf8' is empty. Empty structs are undefined behavior.

class Utf8 extends Struct {

      ^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/ffi-0.1.3/lib/src/utf16.dart:16:7: Error: Struct 'Utf16' is empty. Empty structs are undefined behavior.

class Utf16 extends Struct {

      ^

../../../../../../.pub-cache/hosted/pub.flutter-io.cn/ffi-0.1.3/lib/src/allocation.dart:47:33: Error: Expected type 'T' to be a valid and instantiated subtype of 'NativeType'.

  final int totalSize = count * sizeOf<T>();

                                ^

FAILURE: Build failed with an exception.

* Where:

Script '/Users/cheryl/Documents/work/sdk/flutter_sdk/flutter/packages/flutter_tools/gradle/flutter.gradle' line: 1035

* What went wrong:

Execution failed for task ':app:compileFlutterBuildDebug'.

> Process 'command '/Users/cheryl/Documents/work/sdk/flutter_sdk/flutter/bin/flutter'' finished with non-zero exit value 1

* Try:

Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 12s

Exception: Gradle task assembleDebug failed with exit code 1


我在网上尝试了好多种解决方法

首先清除缓存： flutter clean

如果不行，使用：flutter packages cache repair

结果尝试好多遍依旧不行，报错，后来重启项目，错误信息没有了，项目可以运行了，很奇怪。

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