I'm getting an error trying to run the project at this point

using UnityEngine;
using System.Collections;
using UnityEngine.VR;

public class VRAdjustment : MonoBehaviour {

    private Vector3 monitorRotation = new Vector3 (-12f, 0f, 0f);
    private Vector3 openVRPosition = new Vector3 (0f, -1.75f, 0f);


    // Use this for initialization
    void Awake () {

        // If there is no VR device at the start of the game:
        if (!VRDevice.isPresent) {

            //tilt camera upward for monitor view
            transform.localRotation = Quaternion.Euler (monitorRotation);

        } else {

            //Otherwise, if VR Device available and is OpenVR
            if (VRSettings.loadedDeviceName == "OpenVR") {

                //Then move camera to floor
                transform.localRotation = openVRPosition;
            }

        }
    }

    // Update is called once per frame
    void Update () {

        //If reset of camera needed
        if (Input.GetKeyUp (KeyCode.R)) {

            InputTracking.Recenter ();

        }

    }


    void OnApplicationQuit () {

        // When app quit, disable VR
        VRSettings.enabled = false;


    }
 }