Flutter 构建错误。（与 pub-cache 相关）答案

【问题标题】：Flutter build error.(related to pub-cache)Flutter 构建错误。（与 pub-cache 相关）
【发布时间】：2020-11-29 02:02:50
【问题描述】：

当我尝试构建我的项目时，我在控制台中打印了此错误。

两天前一切正常。

这是错误，

Running "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.org

BUILD FAILED in 4m 13s
Exception: Gradle task assembleDebug failed with exit code 1
Exited (sigterm)

我真的不知道为什么会这样，我尝试谷歌搜索但找不到任何有用的东西。

还有更多错误，与 .pub-cache 相关，但我没有发布，因为那样问题会太长。

请帮忙。

【问题讨论】：

标签： firebase flutter gradle dart build.gradle

【解决方案1】：

错误在“Firebase”包中，删除它，它就可以工作了。

【讨论】：

【解决方案2】：

为了具体说明需要做些什么来帮助看到此问题的其他人，我将在下面进行解释：

当你以某种方式添加下面的导入语句时，你可能会看到这个问题：

import 'package:firebase/firebase.dart';

找到并删除上面的行，清理你的构建（通过运行flutter clean 命令）并再次运行。现在问题应该已经解决了。

【讨论】：