The animation state damage1 could not be played because it couldn't be found!
Please attach an animation clip with the name 'damage1' or call this function only for existing animations.
UnityEngine.Animation:Play(String)
croowbar:OnGUI() (at Assets/croowbar.cs:13)

using UnityEngine;
using System.Collections;

public class croowbar : MonoBehaviour {
public Transform Montirovka;
public AnimationClip damage1;

void OnGUI () {
if (GUI.Button (new Rect (Screen.width / 2 - 50, Screen.height / 2, 100, 50), "fire1"))
{ Vector3 DirectionRay = transform.TransformDirection(Vector3.forward);
RaycastHit Hit;

Montirovka.animation.Play(damage1.name);

if(Physics.Raycast(transform.position, DirectionRay, out Hit, 1.2f))
{
if(Hit.rigidbody)
{
Hit.rigidbody.AddForceAtPosition(DirectionRay*4000f,Hit.point);
}
}
}
}
}