help with an error cant find no solution

Assets/script/PlayerController.cs(15,10): error CS0246: The type or namespace name `PlayerPhysics' could not be found. Are you missing a using directive or an assembly reference?

there are my two scripts ......................................................... playercontroller .........................................................

 using UnityEngine;
 using System.Collections;
 
 [RequireComponent(typeof(PlayerPhysics))]
  public class PlayerController : MonoBehaviour {
 
  //Player Handling
  public float gravity = 20;
  public float speed = 8;
  public float acceleration = 12;
 
  private float currentSpeed;
  private float targetSpeed;
  private Vector2 amountToMove;
  private PlayerPhysics playerphysics; 
 
      
  void Start() {
     PlayerPhysics = GetComponent<PlayerPhysics>();
  
  }
 
  void Update() {
     targetSpeed = Input.GetAxisRaw("Horizontal") * speed;
     currentSpeed = IncrementTowards(currentspeed, targetSpeed,Acceleration);
  
     amountToMove.x = currentSpeed;
     amountToMove.y -= gravity * Time .deltaTime;
     playerphysics.Move(amountToMove * Time.deltaTime);
  }
 
     //increase n towards target by speed
     private float IncrementTowards(float n, float target, float a) {
          if (n == target) {
              return n;
         }
         else {
             float dir = Mathf.Sign(target - n); //must n be increased or decreased to get closer to target
             n += a * Time.deltaTime * dir;
             return (dir == Mathf.Sign(target-n))? n: target; //if n has now passed target then return target, otherwise
         }
    }
 }
 ...............................
 player physics script
 .....................................
 
 sing UnityEngine;
 using System.Collections;
 
 
 [RequireComponent (typeof(BoxCollider))]
 public class playerphysics : MonoBehaviour {
 
     public LayerMask collisionMask;
 
     private BoxCollider collider;
     private Vector3 s;
     private Vector3 c;
 
     private float skin = .005f;
 
     [HideInInspector]
     public bool grounded;
 
     Ray ray;
     RaycastHit hit;
 
 
     void Start() {
         collider = GetComponent<BoxCollider>();
         s = collider.size;
         c = collider.center;
     }
         public void Move(Vector2 moveAmount) {
 
         float deltaY = moveAmount.y;
         float deltax = moveAmount.x;
         Vector2 p = transform.position;
 
 
         for (int i = 0; i<=3; i ++) {
             float dir = Mathf.Sign(deltaY);
             float x = (p.x + c.x - s.x/2) + s.x/2 * i; // Left,centre and then rightmost point of collider
             float y = p.y + c.y + s.y/2 * dir; // Bottom of collider
 
             ray = new Ray(new Vector2(x,y), new Vector2(0,dir));
 
             if (Physics.Raycast(ray,out Hit.Mathf.Abs(deltaY).collisionorMask)) {
                  //Get Distance between player and ground
                 float dst = Vector3.Distance(ray.origin, hit.point);
                 //Stop player's downwards movement after coming within skin width of a collider
                 if(dst > skin) {
                     deltaY = dst + skin;
                 }
                 else {
                     deltaY =0;
                 }
                 grounded = true;
                 break;
             }
             
         }    
                 
 
                 Vector2 finalTransform = new Vector2(deltax,deltaY);
                 
       transform.Translate(finalTransform);
    }
 }