Error: An object reference is required to access non-static member, help?

I'm using Unity 5 to make a simple 2D game following a tutorial and I keep getting this error:

I'm trying to add a jump script to my player and I think it's to do with the fact the tutorial is using unity 4, so there might be script changes. The jump script is referencing a collision state script. Here are my two scripts:

Collision script:

using UnityEngine; using System.Collections;

public class ColissionState : MonoBehaviour {

 public LayerMask collisionLayer;
 public bool standing;
 public Vector2 bottomPosition = Vector2.zero;
 public float collisionRadius = 10f;
 public Color debugCollisionColor = Color.red;
 

 // Use this for initialization
 void Start () {
 
 }
 
 // Update is called once per frame
 void Update () {
 
 }

 void FixedUpdate(){

     var pos = bottomPosition;
     pos.x += transform.position.x;
     pos.y += transform.position.y;

     standing = Physics2D.OverlapCircle(pos, collisionRadius, collisionLayer);
 }


 void OnDrawGizmos(){
     Gizmos.color = debugCollisionColor;

     
     var pos = bottomPosition;
     pos.x += transform.position.x;
     pos.y += transform.position.y;

     Gizmos.DrawWireSphere (pos, collisionRadius);

 }



 

jump script:

using UnityEngine; using System.Collections;

public class Jump : AbstractBehaviour {

 public float jumpSpeed = 200f;
 
 // Use this for initialization
 void Start () {
     
 }
 
 // Update is called once per frame
 void Update () {
     var canJump = inputState.GetButtonValue(inputButtons [0]);
     
     if (ColissionState.standing) {
         if(canJump){
             OnJump();
         }
     }
     
 }
 
 protected virtual void OnJump(){
     var vel = body2d.velocity;
     
     body2d.velocity = new Vector2 (vel.x, jumpSpeed);
 }
 

Thank you!