using UnityEngine;
using System.Collections;

public class FP_Shooting : MonoBehaviour {

	public GameObject bullet_prefab;

	// Use this for initialization
     void Start () {
	// Update is called once per frame
	void Update () {
				if (Input.GetButton ("Fire1")) {
						Instantiate (bullet_prefab, Transform.position, Transform.rotation);


so it says that its a prasing error on the 20row but its empty can somone help me?

It’s not meant to be empty. You need a closing brace, to close the open that opens the class.

Add another } to the end of the script