animation.Play("tiro", PlayMode.StopAll); not working

First, the Unity 3D Hello guys , I liked the program that creates games :) ! Come to that I have a problem , I saw a video of how to add weapons and etc , but I reached a point where I wanted to add an animation when the gun shot was fired , and edited the script etc , but the animation is not performed. Script I use :

https://dl.dropboxusercontent.com/u/99253328/Riffle.js

END OF CODE IS MORE LINE DO NOT PART OF THE SCRIPT

good, the animation of the firing of the bullet is not forfeit by Weapon tab Hierarchy has the Animation component , this is finally someone help me I am grateful , sorry for my bad english , I am Brazilian and I used the google translator to help me ! Images that might help you : http://imagizer.imageshack.us/v2/800x600q90/706/f5w3.jpg