title: google cardboard unity sdk import error for android
body: <p>after downloading and importing cardboard sdk for unity i got these errors. i searched about error CS0246 but answers aren't able to solve it. or i am not getting any typo mistake. i haven't changed any single word in code provided by google. its on windows 7 and for android and i am using unity 4.3. any suggestions?</p>
  
  <p>Assets/Cardboard/Scripts/Cardboard.cs(420,4): error CS0246: The type or namespace name `Tooltip' could not be found. Are you missing a using directive or an assembly reference</p>
  
  <p>Assets/Cardboard/Scripts/StereoController.cs(87,4): error CS0246: The type or namespace name `TooltipAttribute' could not be found. Are you missing a using directive or an assembly reference?![enter image description here][1]</p>