Flutter crash report; please file at https://github.com/flutter/flutter/issues.

## command

flutter upgrade

## exception

ArgumentError: Invalid argument(s): Cannot find executable for /Users/yubo/flutter/bin/cache/dart-sdk/bin/pub.

```
#0      _getExecutable (package:process/src/interface/local_process_manager.dart:113)
#1      LocalProcessManager.start (package:process/src/interface/local_process_manager.dart:41)
#2      runCommand (package:flutter_tools/src/base/process.dart:115)
#3      runCommandAndStreamOutput (package:flutter_tools/src/base/process.dart:133)
<asynchronous suspension>
#4      pub (package:flutter_tools/src/dart/pub.dart:153)
<asynchronous suspension>
#5      pubGet (package:flutter_tools/src/dart/pub.dart:104)
<asynchronous suspension>
#6      UpgradeCommand.runCommand (package:flutter_tools/src/commands/upgrade.dart:75)
<asynchronous suspension>
#7      FlutterCommand.verifyThenRunCommand (package:flutter_tools/src/runner/flutter_command.dart:290)
<asynchronous suspension>
#8      FlutterCommand.run (package:flutter_tools/src/runner/flutter_command.dart:228)
<asynchronous suspension>
#9      CommandRunner.runCommand (package:args/command_runner.dart:194)
<asynchronous suspension>
#10     FlutterCommandRunner.runCommand (package:flutter_tools/src/runner/flutter_command_runner.dart:286)
<asynchronous suspension>
#11     CommandRunner.run.<anonymous closure> (package:args/command_runner.dart:109)
#12     new Future.sync (dart:async/future.dart:222)
#13     CommandRunner.run (package:args/command_runner.dart:109)
#14     FlutterCommandRunner.run (package:flutter_tools/src/runner/flutter_command_runner.dart:166)
#15     run.<anonymous closure> (package:flutter_tools/runner.dart:90)
<asynchronous suspension>
#16     AppContext._run (package:flutter_tools/src/base/context.dart:76)
<asynchronous suspension>
#17     AppContext.runInZone.<anonymous closure> (package:flutter_tools/src/base/context.dart:66)
#18     _rootRun (dart:async/zone.dart:1126)
#19     _CustomZone.run (dart:async/zone.dart:1023)
#20     runZoned (dart:async/zone.dart:1501)
#21     AppContext.runInZone (package:flutter_tools/src/base/context.dart:65)
#22     run (package:flutter_tools/runner.dart:61)
<asynchronous suspension>
#23     main (package:flutter_tools/executable.dart:48)
<asynchronous suspension>
#24     main (file:///Users/yubo/flutter/packages/flutter_tools/bin/flutter_tools.dart:16)
#25     _startIsolate.<anonymous closure> (dart:isolate-patch/dart:isolate/isolate_patch.dart:277)
#26     _RawReceivePortImpl._handleMessage (dart:isolate-patch/dart:isolate/isolate_patch.dart:165)
```

## flutter doctor

```
[✓] Flutter (Channel beta, v0.2.3, on Mac OS X 10.13.4 17E202, locale zh-Hans-CN)
    • Flutter version 0.2.3 at /Users/yubo/flutter
    • Framework revision 5a58b36e36 (7 weeks ago), 2018-04-19 23:36:15 -0700
    • Engine revision 09d05a3891
    • Dart version 2.0.0-dev.35.flutter-290c576264

[!] Android toolchain - develop for Android devices (Android SDK 27.0.3)
    • Android SDK at /Users/yubo/Library/Android/sdk
    • Android NDK location not configured (optional; useful for native profiling support)
    • Platform android-27, build-tools 27.0.3
    • ANDROID_HOME = /Users/yubo/Library/Android/sdk
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-915-b08)
    ✗ Android license status unknown.

[!] iOS toolchain - develop for iOS devices (Xcode 9.3)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 9.3, Build version 9E145
    ✗ libimobiledevice and ideviceinstaller are not installed. To install, run:
        brew install --HEAD libimobiledevice
        brew install ideviceinstaller
    ✗ ios-deploy not installed. To install:
        brew install ios-deploy
    • CocoaPods version 1.4.0

[✓] Android Studio (version 3.0)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-915-b08)

[!] IntelliJ IDEA Community Edition (version 2017.3.4)
    • IntelliJ at /Applications/IntelliJ IDEA CE.app
    ✗ Flutter plugin not installed; this adds Flutter specific functionality.
    ✗ Dart plugin not installed; this adds Dart specific functionality.
    • For information about installing plugins, see
      https://flutter.io/intellij-setup/#installing-the-plugins

[✓] VS Code (version 1.20.0)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Dart Code extension version 2.8.2

[✓] Connected devices (1 available)
    • iPhone X • DB84C665-9CF2-48C1-97EC-BCC3BAB76385 • ios • iOS 11.3 (simulator)

! Doctor found issues in 3 categories.
```