The name `PlatformerCharacter2D' does not exist in the current context

 using UnityEngine;
 
 [RequireComponent(typeof(PlatformerCharacter2D))]
 public class Platformer2DUserControl : MonoBehaviour
 {
     private PlatformerCharacter2D character;
     private bool jump;
 
     void Awake()
     {
         character = GetComponent<PlatformerCharacter2D>();
     }
 
     void Update ()
     {
         // Read the jump input in Update so button presses aren't missed.
         if (Input.GetButtonDown("Jump")) jump = true;
     }
 
     void FixedUpdate()
     {
         // Read the inputs.
         bool crouch = Input.GetKey(KeyCode.LeftControl);
         float h = Input.GetAxis("Horizontal");
 
         // Pass all parameters to the character control script.
         character.Move( h, crouch , jump );
 
         // Reset the jump input once it has been used.
         jump = false;
     }
 }

Hi I got the sample assets on the store and imported the 2d folder and now it doesn't recognise PlatformerCharacter2D. : was following this tutorial https://www.youtube.com/watch?v=UbPiCgCkHTE i already got rid of this error [http://answers.unity3d.com/questions/755466/the-name-crossplatforminput-does-not-exist-in-the.html] but it still won't work.