BCE0044 problem don't know need help

This problem showing up in the console Assets/BallControl.js(11,1):BCE0044:expecting}, found".
and this is the script:

#pragma strict

var rotationSpeed = 100;

function Update () {
{
var rotation : float = Input.GetAxis (“Horizontal”) * rotationSpeed;
rotation *= Time.deltaTime;
rigidbody.AddRelativeTorque (Vector3.back * rotation);
}

Can someone please tell me what is wrong. Thanks.

You put two open braces at the start of your Update function, but only one at the end. It’s telling you cryptically that it was expecting to see another closing brace somewhere, but it got to the end of the file (line 11) first.

Thanks