title: Android studio: Gradle project sync failed
body: <p>I just have installed Android studio on Mac, updated to version 0.5.4. Then created a new app, just basic thing, by clicking next, next, next...
  And After I open "MainActivity", I get an error saying "Gradle project sync failed. Gradle 'MyApplication' project refresh failed: Cause: error in opening zip file"
  Any ideas how to solve this? I've been browsing this forum, but no solution found.</p>