如何解决此问题错误：无法解析包？

Question

如何解决此问题错误：无法解析包？

Meh*_*san 5 android caching gradle flutter flutter-layout

我面临这个问题。我怎么解决这个问题。请帮我。

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Error: Couldn't resolve the package 'intl' in 'package:intl/intl.dart'.\nlib/screens/chat.dart:4:8: Error: Not found: 'package:intl/intl.dart'\nimport 'package:intl/intl.dart';\n       ^\nlib/screens/chat.dart:98:13: Error: 'DateFormat' isn't a type.\n      final DateFormat date_formatter = DateFormat('yyyy-MM-dd');\n            ^^^^^^^^^^\nlib/screens/chat.dart:99:13: Error: 'DateFormat' isn't a type.\n      final DateFormat time_formatter = DateFormat('hh:ss');\n            ^^^^^^^^^^\nlib/screens/chat.dart:98:41: Error: The method 'DateFormat' isn't defined for the class '_\nChatState'.\n - '_ChatState' is from 'package:ecommerce_flutter/screens/chat.dart' ('lib/screens\n/chat.dart').\nTry correcting the name to the name of an existing method, or defining a method named 'Dat\neFormat'.\n      final DateFormat date_formatter = DateFormat('yyyy-MM-dd');\n                                        ^^^^^^^^^^\nlib/screens/chat.dart:99:41: Error: The method 'DateFormat' isn't defined for the class '_\nChatState'.\n - '_ChatState' is from 'package:ecommerce_flutter/screens/chat.dart' ('lib/screens\n/chat.dart').\nTry correcting the name to the name of an existing method, or defining a method named 'Dat\neFormat'.\n      final DateFormat time_formatter = DateFormat('hh:ss');\n                                        ^^^^^^^^^^\n/C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/chewie-0.9.10/lib/src/chewie_player.dar\nt:83:7: Error: No named parameter with the name 'resizeToAvoidBottomPadding'.\n      resizeToAvoidBottomPadding: false,\n      ^^^^^^^^^^^^^^^^^^^^^^^^^^\n/C:/src/flutter/packages/flutter/lib/src/material/scaffold.dart:1466:9: Context: Found thi\ns candidate, but the arguments don't match.\n  const Scaffold({\n        ^^^^^^^^\n/C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/chewie-0.9.10/lib/src/chewie_player.dar\nt:276:17: Error: The method 'inheritFromWidgetOfExactType' isn't defined for the class 'Bu\nildContext'.\n - 'BuildContext' is from 'package:flutter/src/widgets/framework.dart' ('/C:/src/flutter/p\nackages/flutter/lib/src/widgets/framework.dart').\nTry correcting the name to the name of an existing method, or defining a method named 'inh\neritFromWidgetOfExactType'.\n        context.inheritFromWidgetOfExactType(_ChewieControllerProvider)\n                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n/C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/chewie_audio-1.0.0+1/lib/src/chewie_pla\nyer.dart:101:17: Error: The method 'inheritFromWidgetOfExactType' isn't defined for the cl\nass 'BuildContext'.\n - 'BuildContext' is from 'package:flutter/src/widgets/framework.dart' ('/C:/src/flutter/p\nackages/flutter/lib/src/widgets/framework.dart').\nTry correcting the name to the name of an existing method, or defining a method named 'inh\neritFromWidgetOfExactType'.\n        context.inheritFromWidgetOfExactType(_ChewieAudioControllerProvider)\n                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n/C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_svg-0.18.1/lib/src/picture_prov\nider.dart:50:59: Error: No named parameter with the name 'nullOk'.\n        context != null ? Localizations.localeOf(context, nullOk: true) : null,\n                                                          ^^^^^^\n/C:/src/flutter/packages/flutter/lib/src/widgets/localizations.dart:413:17: Context: Found\n this candidate, but the arguments don't match.\n  static Locale localeOf(BuildContext context) {\n                ^^^^^^^^\nUnhandled exception:\nFileSystemE\nxception(uri=org-dartlang-untranslatable-uri:package%3Aintl%2Fintl.dart; message=StandardFileSystem only supports file:* and data:* URIs)\n#0      StandardFileSystem.entityForUri (package:front_end/src/api_proto\ntype/standard_file_system.dart:36:7)\n#1      asFileUri (package:vm/ker\nnel_front_end.dart:599:37)\n#2      writeDepfile (package:vm/kernel_front_end.dart:738:21)\n<asynchrono\nus suspension>\n#3      FrontendCompiler.compile (package:frontend_server/frontend_server.\ndart:562:9)\n<asynchronous suspension>\n#4      starter (package:flutter_fron\ntend_server/server.dart:180:12)\n<asynchronous suspension>\n#5      main (file:///C:/b\n/s/w/ir/cache/builder/src/flutter/flutter_frontend_server/bin/starter.dart:13:2\n4)\n<asynchronous suspension>\n\nFAILURE: Build failed with an exception.\n\n* Where:\nScript 'C:\\src\\flutter\\packages\\flutter_tools\\gradle\\flutter.gradle' line: 1035\n\n* What went wrong:\nExecution failed for task ':app:compileFlutterBuildRelease'.\n> Process 'command 'C:\\src\\flutter\\bin\\flutter.bat'' finished with non-zero exit value 1\n\n* Try:\nRun with --stacktrace option to get the stack trace. Run with --info or --debug option to\nget more log output. Run with --scan to get full insights.\n\nC:\\src\\flutter\\bin\\flutter.bat doctor --verbose\n[\xe2\x88\x9a] Flutter (Channel stable, 2.2.2, on Microsoft Windows [Version 10.0.19042.1052], locale en-US)\n    \xe2\x80\xa2 Flutter version 2.2.2 at C:\\src\\flutter\n    \xe2\x80\xa2 Framework revision d79295af24 (7 days ago), 2021-06-11 08:56:01 -0700\n    \xe2\x80\xa2 Engine revision 91c9fc8fe0\n    \xe2\x80\xa2 Dart version 2.13.3\n\n[\xe2\x88\x9a] Android toolchain - develop for Android devices (Android SDK version 30.0.2)\n    \xe2\x80\xa2 Android SDK at C:\\Users\\mehed\\AppData\\Local\\Android\\sdk\n    \xe2\x80\xa2 Platform android-30, build-tools 30.0.2\n    \xe2\x80\xa2 Java binary at: C:\\Program Files\\Android\\Android Studio\\jre\\bin\\java\n    \xe2\x80\xa2 Java version OpenJDK Runtime Environment (build 11.0.8+10-b944.6842174)\n    \xe2\x80\xa2 All Android licenses accepted.\n\n[\xe2\x88\x9a] Chrome - develop for the web\n    \xe2\x80\xa2 Chrome at C:\\Program Files\\Google\\Chrome\\Application\\chrome.exe\n\n[\xe2\x88\x9a] Android Studio (version 4.1.0)\n    \xe2\x80\xa2 Android Studio at C:\\Program Files\\Android\\Android Studio\n    \xe2\x80\xa2 Flutter plugin can be installed from:\n       https://plugins.jetbrains.com/plugin/9212-flutter\n    \xe2\x80\xa2 Dart plugin can be installed from:\n       https://plugins.jetbrains.com/plugin/6351-dart\n    \xe2\x80\xa2 Java version OpenJDK Runtime Environment (build 11.0.8+10-b944.6842174)\n\n[\xe2\x88\x9a] VS Code (version 1.57.0)\n    \xe2\x80\xa2 VS Code at C:\\Users\\mehed\\AppData\\Local\\Programs\\Microsoft VS Code\n    \xe2\x80\xa2 Flutter extension version 3.23.0\n\n[\xe2\x88\x9a] Connected device (2 available)\n    \xe2\x80\xa2 Chrome (web) \xe2\x80\xa2 chrome \xe2\x80\xa2 web-javascript \xe2\x80\xa2 Google Chrome 91.0.4472.101\n    \xe2\x80\xa2 Edge (web)   \xe2\x80\xa2 edge   \xe2\x80\xa2 web-javascript \xe2\x80\xa2 Microsoft Edge 91.0.864.48\n\n\xe2\x80\xa2 No issues found!\nProcess finished with exit code 0\n

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