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Flutter crash report; please file at https://github.com/flutter/flutter/issues.
## command
flutter packages get
## exception
FileSystemException: FileSystemException: Cannot open file, path = '/Users/apple/Downloads/flutter/bin/cache/downloads/storage.flutter-io.cn/flutter_infra/flutter/fee001c93f25a1e7258e762781a7361f122d29f5/ios-release/artifacts.zip' (OS Error: No such file or directory, errno = 2)
```
#0 _File.throwIfError (dart:io/file_impl.dart:643:7)
#1 _File.openSync (dart:io/file_impl.dart:487:5)
#2 _File.writeAsBytesSync (dart:io/file_impl.dart:612:31)
#3 _LocalFile&LocalFileSystemEntity&ForwardingFile.writeAsBytesSync (package:file/src/forwarding/forwarding_file.dart:129:16)
#4 _downloadFile (package:flutter_tools/src/cache.dart:935:12)
<asynchronous suspension>
#5 CachedArtifact._downloadArchive.<anonymous closure> (package:flutter_tools/src/cache.dart:404:17)
<asynchronous suspension>
#6 CachedArtifact._withDownloadFile (package:flutter_tools/src/cache.dart:433:26)
<asynchronous suspension>
#7 CachedArtifact._downloadArchive (package:flutter_tools/src/cache.dart:400:12)
#8 CachedArtifact._downloadZipArchive (package:flutter_tools/src/cache.dart:420:12)
#9 EngineCachedArtifact.updateInner (package:flutter_tools/src/cache.dart:567:13)
<asynchronous suspension>
#10 CachedArtifact.update (package:flutter_tools/src/cache.dart:363:11)
<asynchronous suspension>
#11 Cache.updateAll (package:flutter_tools/src/cache.dart:287:26)
<asynchronous suspension>
#12 FlutterCommand.verifyThenRunCommand (package:flutter_tools/src/runner/flutter_command.dart:467:19)
<asynchronous suspension>
#13 FlutterCommand.run.<anonymous closure> (package:flutter_tools/src/runner/flutter_command.dart:383:33)
<asynchronous suspension>
#14 AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:153:29)
<asynchronous suspension>
#15 _rootRun (dart:async/zone.dart:1124:13)
#16 _CustomZone.run (dart:async/zone.dart:1021:19)
#17 _runZoned (dart:async/zone.dart:1516:10)
#18 runZoned (dart:async/zone.dart:1463:12)
#19 AppContext.run (package:flutter_tools/src/base/context.dart:152:18)
<asynchronous suspension>
#20 FlutterCommand.run (package:flutter_tools/src/runner/flutter_command.dart:375:20)
#21 CommandRunner.runCommand (package:args/command_runner.dart:197:27)
<asynchronous suspension>
#22 FlutterCommandRunner.runCommand.<anonymous closure> (package:flutter_tools/src/runner/flutter_command_runner.dart:396:21)
<asynchronous suspension>
#23 AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:153:29)
<asynchronous suspension>
#24 _rootRun (dart:async/zone.dart:1124:13)
#25 _CustomZone.run (dart:async/zone.dart:1021:19)
#26 _runZoned (dart:async/zone.dart:1516:10)
#27 runZoned (dart:async/zone.dart:1463:12)
#28 AppContext.run (package:flutter_tools/src/base/context.dart:152:18)
<asynchronous suspension>
#29 FlutterCommandRunner.runCommand (package:flutter_tools/src/runner/flutter_command_runner.dart:356:19)
<asynchronous suspension>
#30 CommandRunner.run.<anonymous closure> (package:args/command_runner.dart:112:25)
#31 new Future.sync (dart:async/future.dart:224:31)
#32 CommandRunner.run (package:args/command_runner.dart:112:14)
#33 FlutterCommandRunner.run (package:flutter_tools/src/runner/flutter_command_runner.dart:242:18)
#34 run.<anonymous closure>.<anonymous closure> (package:flutter_tools/runner.dart:62:22)
<asynchronous suspension>
#35 _rootRun (dart:async/zone.dart:1124:13)
#36 _CustomZone.run (dart:async/zone.dart:1021:19)
#37 _runZoned (dart:async/zone.dart:1516:10)
#38 runZoned (dart:async/zone.dart:1500:12)
#39 run.<anonymous closure> (package:flutter_tools/runner.dart:60:18)
<asynchronous suspension>
#40 AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:153:29)
<asynchronous suspension>
#41 _rootRun (dart:async/zone.dart:1124:13)
#42 _CustomZone.run (dart:async/zone.dart:1021:19)
#43 _runZoned (dart:async/zone.dart:1516:10)
#44 runZoned (dart:async/zone.dart:1463:12)
#45 AppContext.run (package:flutter_tools/src/base/context.dart:152:18)
<asynchronous suspension>
#46 runInContext (package:flutter_tools/src/context_runner.dart:56:24)
<asynchronous suspension>
#47 run (package:flutter_tools/runner.dart:51:10)
#48 main (package:flutter_tools/executable.dart:62:9)
<asynchronous suspension>
#49 main (file:///Users/apple/Downloads/flutter/packages/flutter_tools/bin/flutter_tools.dart:8:3)
#50 _startIsolate.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:299:32)
#51 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:172:12)
```
## flutter doctor
```
[33m[!][39m Flutter (Channel stable, v1.7.8+hotfix.4, on Mac OS X 10.15 19A583, locale zh-Hans-CN)
[32m•[39m Flutter version 1.7.8+hotfix.4 at /Users/apple/Downloads/flutter
[32m•[39m Framework revision 20e59316b8 (4 months ago), 2019-07-18 20:04:33 -0700
[32m•[39m Engine revision fee001c93f
[32m•[39m Dart version 2.4.0
[31m✗[39m Downloaded executables cannot execute on host.
See https://github.com/flutter/flutter/issues/6207 for more information
[33m[!][39m Android toolchain - develop for Android devices (Android SDK version 29.0.1)
[32m•[39m Android SDK at /Users/apple/Library/Android/sdk
[32m•[39m Android NDK location not configured (optional; useful for native profiling support)
[32m•[39m Platform android-29, build-tools 29.0.1
[32m•[39m ANDROID_HOME = /Users/apple/Library/Android/sdk
[32m•[39m Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
[32m•[39m Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)
[31m✗[39m Android license status unknown.
Try re-installing or updating your Android SDK Manager.
See https://developer.android.com/studio/#downloads or visit https://flutter.dev/setup/#android-setup for detailed
instructions.
[32m[✓][39m Xcode - develop for iOS and macOS (Xcode 11.2)
[32m•[39m Xcode at /Applications/Xcode.app/Contents/Developer
[32m•[39m Xcode 11.2, Build version 11B52
[32m•[39m CocoaPods version 1.8.4
[32m[✓][39m iOS tools - develop for iOS devices
[32m•[39m ios-deploy 1.9.4
[32m[✓][39m Android Studio (version 3.5)
[32m•[39m Android Studio at /Applications/Android Studio.app/Contents
[32m•[39m Flutter plugin version 41.1.2
[32m•[39m Dart plugin version 191.8593
[32m•[39m Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)
[33m[!][39m IntelliJ IDEA Community Edition (version 2019.2.4)
[32m•[39m IntelliJ at /Applications/IntelliJ IDEA CE.app
[31m✗[39m Flutter plugin not installed; this adds Flutter specific functionality.
[31m✗[39m Dart plugin not installed; this adds Dart specific functionality.
[32m•[39m For information about installing plugins, see
https://flutter.dev/intellij-setup/#installing-the-plugins
[32m[✓][39m Connected device (2 available)
[32m•[39m CLT AL01 • AKC0218316000622 • android-arm64 • Android 9 (API 28)
[32m•[39m sy的 iPhone • 4d2409304573b5f7f07fdb9b09250634d6eb9f11 • ios • iOS 13.1.3
[33m![39m Doctor found issues in 3 categories.
```