new event has no reciever?

'Human_1T' AnimationEvent 'NewEvent' has no receiver! Are you missing a component?
every time i press "Fire3" which i have left shift set as the input, the game quits and i get the error above

Code (JavaScript):

1. #pragma strict
2.  
3. var playerAnim : Animator;
4. var v : float;
5. var h : float;
6. var sprint : float;
7.  
8. function Start () {
9. playerAnim = GetComponent(Animator);
10.  
11. }
12.  
13. function Update () {
14. v = Input.GetAxis("Vertical");
15. h = Input.GetAxis("Horizontal");
16. Sprinting();
17. }
18.  
19. function FixedUpdate()
20. {
21. playerAnim.SetFloat("Walk", v);
22. playerAnim.SetFloat("Turn", h);
23. playerAnim.SetFloat("Sprint", sprint);
24. }
25.  
26. function Sprinting ()
27. {
28. if(Input.GetButtonDown("Fire3")){
29. sprint = 0.2;
30. }
31. else {
32. sprint = 0.0;
33. }
34. }
35.