當(dāng)我嘗試構(gòu)建這個(gè)項(xiàng)目時(shí)，我在控制臺(tái)中打印了這個(gè)錯(cuò)誤。但是，當(dāng)我嘗試構(gòu)建其他項(xiàng)目時(shí)，沒有發(fā)生任何錯(cuò)誤。這是為什么？2 天前一切正常。這是錯(cuò)誤，unning "flutter pub get" in SampleApp...Launching lib\main.dart on Android SDK built for x86 in debug mode.../E:/flutter/.pub-cache/hosted/pub.dartlang.org/firebase-7.3.0/lib/src/top_level.dart:1:8: Error: Not found: 'dart:html'import 'dart:html';       ^/E:/flutter/.pub-cache/hosted/pub.dartlang.org/js-0.6.2/lib/js.dart:8:1: Error: Not found: 'dart:js'export 'dart:js' show allowInterop, allowInteropCaptureThis;^/E:/flutter/.pub-cache/hosted/pub.dartlang.org/js-0.6.2/lib/js_util.dart:8:1: Error: Not found: 'dart:js_util'export 'dart:js_util';^/E:/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_svg-0.17.4/lib/src/picture_stream.dart:88:26: Error: Type 'DiagnosticableMixin' not found.class PictureStream with DiagnosticableMixin {                         ^^^^^^^^^^^^^^^^^^^/E:/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_svg-0.17.4/lib/src/picture_stream.dart:192:44: Error: Type 'DiagnosticableMixin' not found.abstract class PictureStreamCompleter with DiagnosticableMixin {                                           ^^^^^^^^^^^^^^^^^^^FAILURE: Build failed with an exception.* Where:Script 'E:\flutter\packages\flutter_tools\gradle\flutter.gradle' line: 896* What went wrong:Execution failed for task ':app:compileFlutterBuildDebug'.> Process 'command 'E:\flutter\bin\flutter.bat'' 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.orgBUILD FAILED in 4m 13sException: Gradle task assembleDebug failed with exit code 1Exited (sigterm)我試過跑步flutter clean，但沒有用。