Hi im getting this error in my script Assets/MouseManager.cs(11,27): error CS1525: Unexpected symbol `Vector3'

using UnityEngine; using System.Collections;

public class MouseManager : MonoBehaviour {

 void Update() {
     if( Input.GetMouseButtonDown (0)
         // We clicked, but on what?

     
         Vector3 mouseWorldPos3D = Camera.main.ScreenToWorldPoint(Input.mousePosition);

         Vector2 mousePos2D = new Vector2(Input.mouseWorldPos3D.x, Input.mouseWorldPos3D.y);
     
         Vector2 dir = Vector2.zero;

         RaycastHit2D hit = Physics2D.Raycast (mousePos2D, dir);
         if(hit != null && hit.collider!=null) {
            // We clicked on SOMETHING that has a collider
            if(hit.collider.rigidbody2D !=null) {
                hit.collider.rigidbody2D.gravityScale = 1;
           }
       }
   }

}