object reference problem

I am getting this really annoying error and I have no idea how to fix it. Hope you can help
error CS0120: An object reference is required to access non static member ‘Unity.AudioSource.volume’
This is my script

using UnityEngine;
using System.Collections;

public class volumechange : MonoBehaviour
public static int volume;
public AudioSource;

// Update is called once per frame
void Update () {
	if (volume == 1)
		AudioSource.volume = 10;
	if (volume == 0)
		AudioSource.volume = 0; 


AudioSource is the class. What you want is a reference to the actual AudioSource attached to the specific game object (I’m guessing). You can use ‘audio’. Note that ‘volume’ goes from 0.0 to 1.0.

audio.volume = 1.0;