title: SteamVR_Controller could not be found
body: <p>I am trying to create a Pokemon Go clone in Unity following this tutorial (<a href="https://www.youtube.com/watch?v=XH942mANiv4" rel="nofollow noreferrer">https://www.youtube.com/watch?v=XH942mANiv4</a>). However, I'm trying to also make it work in VR with SteamVR. </p>
  
  <p>However, following the guide to the Vive on Wenderlich's website here (<a href="https://www.raywenderlich.com/792-htc-vive-tutorial-for-unity" rel="nofollow noreferrer">https://www.raywenderlich.com/792-htc-vive-tutorial-for-unity</a>), I get the following error:</p>
  
  <p>Assets/Scripts/ViveControllerInput.cs(7,13): error CS0246: The type or namespace name 'SteamVR_TrackedObject' could not be found. Are you missing 'Valve.VR' using directive? </p>
  
  <p>I am dragging the ViveControllerInputTest onto both controllers, but I still get this compile error. </p>
  
  <p>Without the script, I am able to put on the headset and see the controllers and walk around. </p>
  
  <p>Any help would be appreciated! Thank you</p>