Steps to Reproduce

I added two dependencies and run package get..

dependencies:
flutter:
sdk: flutter
google_sign_in: "^0.0.2"
firebase_auth: "^0.0.2+1"

Logs

/Users/yongjun/dev_sdk/flutter/bin/flutter --no-color packages get
Running "flutter packages get" in sotong...

Oops; flutter has exited unexpectedly.
Sending crash report to Google.
Crash report sent (report ID: f21d61ac58000000)
Crash report written to /Users/yongjun/git/flutter/sotong/flutter_04.log;
please let us know at https://github.com/flutter/flutter/issues.
Process finished with exit code 1

Flutter Doctor

[✓] Flutter (on Mac OS X 10.12.5 16F73, locale ko-KR, channel alpha)
• Flutter at /Users/yongjun/dev_sdk/flutter
• Framework revision e2f54df (10 days ago), 2017-06-02 10:43:54 -0700
• Engine revision 1f2aa07
• Tools Dart version 1.24.0-dev.3.0

[✓] Android toolchain - develop for Android devices (Android SDK 26.0.0)
• Android SDK at /Users/yongjun/Library/Android/sdk
• Platform android-26, build-tools 26.0.0
• ANDROID_HOME = /Users/yongjun/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_112-release-b06)

[✓] iOS toolchain - develop for iOS devices (Xcode 8.3.3)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 8.3.3, Build version 8E3004b
• ios-deploy 1.9.1
• CocoaPods version 1.0.1

[✓] Android Studio (version 2.3)
• Android Studio at /Applications/Android Studio.app/Contents
• Gradle version 3.2
• Java version: OpenJDK Runtime Environment (build 1.8.0_112-release-b06)

[✓] IntelliJ IDEA Community Edition (version 2017.1.4)
• Dart plugin version 171.4694.29
• Flutter plugin version 14.0

[✓] Connected devices
• Nexus 6P • ENU7N15B12009629 • android-arm • Android 7.1.2 (API 25)