Script copied exactly, yet I get the console errors

I am doing this tutorial on making a sphere on a long rectangle jump by pressing the W key, and I can roll the ball using A or D. This is the 2nd time I've followed one of this guys tutorials which produce console errors for me and not for him. Here is a screenshot of his code on youtube:

And here is my code, followed by the Unity console error:

 #pragma strict
 
 var rotationSpeed = 100;
 var jumpHeight = 8;
 
 private var isFalling = false;
 
 function Update ()
 (
     //handle ball rotation
     var rotation : float = Input.GetAxis ("Horizontal") * rotationSpeed;
     rotation *= Time.deltaTime;
     rigidbody.AddRelativeTorque (Vector3.back * rotation);
     
     if (Input.GetKeyDown(KeyCode.W))
     (
         rigidbody.velocity.y = jumpHeight;
     )
 )

And error:

What gives???