title: appcompat-v7: Android HelloWorld App Error
body: <p>i just installed AndroidStudio on a MacBook Pro. At first i had i couple of problems with the SDKs but it seems fine right now. However when i create a blank Application via <code>new Project...</code> it seems to have a couple of errors.</p>
  
  <p>When i try to compile i get the following message:</p>
  
  <blockquote>
    <p>Gradle: A problem occurred configuring project ':EBVDemo'.
    Failed to notify project evaluation listener.
    Could not resolve all dependencies for configuration ':EBVDemo:_DebugCompile'.
    Could not find any version that matches com.android.support:appcompat-v7:+.
            Required by:
                EBVDemoProject:EBVDemo:unspecified</p>
  </blockquote>
  
  <p>After the first compile attempt the MainActivity was also marked with an error, saying it couldn't resolve ActionBarActivity. </p>
  
  <p>I have an installation on a linux machine without these problems. Could anybody help? Thanks!</p>