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Error Message

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an object reference is required to access non static member error. I'm quite new to unity and c# so I'm sure I'm just not referencing it properly or something but can someone please tell me what I'm doing wrong? I'm trying to add force to a rigidbody. using UnityEngine; using System.Collections; public class PlayerController : MonoBehaviour { public GameObject player; private static Rigidbody2D rb2d; public int speed; void Start () { Rigidbody2D rb2d = gameObject.GetComponent(); speed = 0; player = this.gameObject; } void Update() { float moveHorizontal = Input.GetAxis ("Horizontal"); float moveVertical = Input.GetAxis ("Vertical"); Vector2 moveDirection = new Vector2 (moveHorizontal, moveVertical); } public void AddForce(){ Rigidbody2D rb2d = Rigidbody2D.AddForce(moveDirection, ForceMode2D.Force); } }

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