Steps to Reproduce

If I create a new app with "flutter create myapp" and then try to launch it either on Simulator or on my iPod Touch, then I have the following error:
error: The sandbox is not in sync with the Podfile.lock. Run 'pod install' or update your CocoaPods installation.

This is only resolved by performing a 'pod install' in the ios folder.

Flutter Doctor

[✓] Flutter (on Mac OS, channel alpha)
• Flutter at /Users/Yoyo/flutter
• Framework revision 9a0a0d9 (11 days ago), engine revision f8d80c4

[✓] Android toolchain - develop for Android devices (Android SDK 24.0.0-preview)
• Android SDK at /Yoyo/AndroidSDK
• Platform android-N, build-tools 24.0.0-preview
• Java(TM) SE Runtime Environment (build 1.8.0_91-b14)

[✓] iOS toolchain - develop for iOS devices (Xcode 7.3.1)
• XCode at /Applications/Xcode.app/Contents/Developer
• Xcode 7.3.1, Build version 7D1014

[✓] Atom - a lightweight development environment for Flutter
• flutter plugin version 0.2.4
• dartlang plugin version 0.6.37