CS0103 error when building scenes

Hi,

I'm currently learning to program in Unity. I followed a tutorial and had the following script working in UNity 2018.2. I have an older project in UNity 2017.4 and now I'm getting these errors.

PlayIntro.cs(19,9): error CS0103: The name `Handheld' does not exist in the current context

Build completed with a result of 'Failed' UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

UnityEditor.BuildPlayerWindow+BuildMethodException: 2 errors at UnityEditor.BuildPlayerWindow+DefaultBuildMethods.BuildPlayer (BuildPlayerOptions options) [0x0020e] in C:\buildslave\unity\build\Editor\Mono\BuildPlayerWindowBuildMethods.cs:181 at UnityEditor.BuildPlayerWindow.CallBuildMethods (Boolean askForBuildLocation, BuildOptions defaultBuildOptions) [0x00065] in C:\buildslave\unity\build\Editor\Mono\BuildPlayerWindowBuildMethods.cs:88 UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

Here is the code:

using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.SceneManagement;

public class PlayIntro : MonoBehaviour {

 private string movie = "splash.mp4";
 public string sceneToLoad;

 void Start () 
 {
     StartCoroutine(streamVideo(movie));
 }

 private IEnumerator streamVideo(string video)
 {
     Handheld.PlayFullScreenMovie(video, Color.black, FullScreenMovieControlMode.Hidden, FullScreenMovieScalingMode.Fill);
     yield return new WaitForSeconds (12);
     SceneManager.LoadScene (sceneToLoad);
 }

}

Have been unable to figure out what's wrong. Any help will be greatly appreciated.

Thanks.