Assets/Scripts/CarCameraScript.js(35,33) '+' Cannot be used with a left hand side of type 'float' and a right hand side of type 'UnityEngine.Vector3' Help?

#pragma strict
var car : Transform;
var distance : float = 6.4;
var height : float = 1.4;
var rotationDamping : float = 3.0;
var heightDamping : float = 2.0;
var zoomRatio : float = 0.5;
var DefaultFOV : float = 60;
private var rotationVector : Vector3;
function Start () {
}

function LateUpdate () {
var wantedAngle = rotationVector.y;
var wantedHeight = car.position.y + height;
var myAngle = transform.eulerAngles.y;
var myHeight = transform.position.y;
myAngle = Mathf.LerpAngle(myAngle,wantedAngle,rotationDamping*Time.deltaTime);
myHeight = Mathf.Lerp(myHeight,wantedHeight,heightDamping*Time.deltaTime);
var currentRotation = Quaternion.Euler(0,myAngle,0);
transform.position = car.position;
transform.position -= currentRotation*Vector3.forward*distance;
transform.position.y = myHeight;
transform.LookAt(car);
}
function FixedUpdate (){
var localVilocity = car.InverseTransformDirection(car.rigidbody.velocity);
if (localVilocity.z<-0.5){
rotationVector.y = car.eulerAngles.y + 180;
}
else {
rotationVector.y = car.eulerAngles.y;
}
var acc = car.rigidbody.velocity;
camera.fieldOfView = DefaultFOV + acc*zoomRatio;
}

The problem is exactly as the error message states. You can’t add a float to a vector3.

var DefaultFOV : float = 60; // <--- This is a float
var acc = car.rigidbody.velocity; // <--- this is a vector3

camera.fieldOfView = DefaultFOV + acc*zoomRatio; // <--- this line won't work.

You probably want to use car.rigidbody.velocity.magnitude instead.