Unexpected "{" and parsing error (roll a ball tutorial)

I've been doing the "Roll a ball" tutorial, and i thought i had done everything as it needed to be. But it keeps nagging me about 3 errors. If anyone please can explain to me what i've done wrong, i'd really appreciate it.

 using UnityEngine.UI;
 using System.Collections;
 
 public class PlayerController : MonoBehaviour 
 
 {    
     public float speed;
     public Text countText;
     private int count;
 
     void start ()
     {
         count = 0;
         SetCountText ()
     }
 
     void FixedUpdate ()
     {
         float moveHorizontal = Input.GetAxis ("Horizontal");
         float moveVertical = Input.GetAxis ("Vertical");
 
         Vector3 movement = new Vector3 (moveHorizontal, 0.0f, moveVertical);
 
         rigidbody.AddForce (movement * speed * Time.deltaTime);
     }
 
     void OnTriggerEnter(Collider other)
     {
         if(other.gameObject.tag == "Pickup")
         {
             other.gameObject.SetActive(false);
             count = count + 1;
             SetCountText ()
         }
     }
 
     void SetCountText ()
     {
         countText.text = "Count" + count.ToString ();
     }
 }