title: Error on running new project in Android studio
body: <p>I just installed Android Studio 0.3. After creating a new Project (I've not changed the code) I get error on <code>R.layout.activity_main</code> and every line that uses <code>R</code> class saying</p>
  
  <blockquote>
    <p>Cannot resolve symbol R</p>
  </blockquote>
  
  <p>.
  Also on the bottom of the screen in warning/console segment I get this error:</p>
  
  <blockquote>
    <p>Gradle: Execution failed for task ":First_Test:mergeDebugResources".
    /home/alireza/AndroidStudioProjects/First_TestProject/First_Test/src/main/res/drawable-xhdpi/ic_launcher.png:
    Error: Cannot run program
    "/home/alireza/IDEs/android-studio/sdk/build-tools/android-4.4/aapt":
    error=2, No such file or directory</p>
  </blockquote>
  
  <p>It's my first time I use Android studio and I'm new to Linux (mint Olivia) so I would be very greatful if you help me this issue</p>