Why is this player script not working

var grenadesGUI : GUIText; var bulletGUI : GUIText; var shotgunGUI : GUIText; var rocketGUI : DrawRockets; var healthGUI : GUITexture;

var walkSounds : AudioClip[]; var painLittle : AudioClip; var painBig : AudioClip; var die : AudioClip; var audioStepLength = 0.3;

private var machineGun : MachineGun; private var shotgun : Shotgun; private var rocketLauncher : RocketLauncher; private var grenadeLauncher : GrenadeLauncher; private var healthGUIWidth = 0.0; private var gotHitTimer = -1.0;

var rocketTextures : Texture[];

function Awake () { shotgun = GetComponentInChildren(Shotgun); machineGun = GetComponentInChildren(MachineGun); rocketLauncher = GetComponentInChildren(RocketLauncher); grenadeLauncher = GetComponentInChildren(GrenadeLauncher);

 PlayStepSounds();

 healthGUIWidth = healthGUI.pixelInset.width;

}

function ApplyDamage (damage : float) { if (hitPoints < 0.0) return;

 // Apply damage
 hitPoints -= damage;

 // Play pain sound when getting hit - but don't play so often
 if (Time.time > gotHitTimer && painBig && painLittle) {
     // Play a big pain sound
     if (hitPoints < maximumHitPoints * 0.2 || damage > 20) {
         audio.PlayOneShot(painBig, 1.0 / audio.volume);
         gotHitTimer = Time.time + Random.Range(painBig.length * 2, painBig.length * 3);
     } else {
         // Play a small pain sound
         audio.PlayOneShot(painLittle, 1.0 / audio.volume);
         gotHitTimer = Time.time + Random.Range(painLittle.length * 2, painLittle.length * 3);
     }
 }

 // Are we dead?
 if (hitPoints < 0.0)
     Die();

}

function Die () { if (die) AudioSource.PlayClipAtPoint(die, transform.position);

 // Disable all script behaviours (Essentially deactivating player control)
 var coms : Component[] = GetComponentsInChildren(MonoBehaviour);
 for (var b in coms) {
     var p : MonoBehaviour = b as MonoBehaviour;
     if (p)
         p.enabled = false;
 }

 LevelLoadFade.FadeAndLoadLevel(Application.loadedLevel, Color.white, 2.0);

}

function LateUpdate () { // Update gui every frame // We do this in late update to make sure machine guns etc. were already executed UpdateGUI(); }

function PlayStepSounds () { var controller : CharacterController = GetComponent(CharacterController);

 while (true) {
     if (controller.isGrounded && controller.velocity.magnitude > 0.3) {
         audio.clip = walkSounds[Random.Range(0, walkSounds.length)];
         audio.Play();
         yield WaitForSeconds(audioStepLength);
     } else {
         yield;
     }
 }

}

function UpdateGUI () { // Update health gui // The health gui is rendered using a overlay texture which is scaled down based on health // - Calculate fraction of how much health we have left (0...1) var healthFraction = Mathf.Clamp01(hitPoints / maximumHitPoints);

 // - Adjust maximum pixel inset based on it
 healthGUI.pixelInset.xMax = healthGUI.pixelInset.xMin + healthGUIWidth * healthFraction;

 // Update machine gun gui
 // Machine gun gui is simply drawn with a bullet counter text
 if (machineGun) {
     bulletGUI.text = machineGun.GetBulletsLeft().ToString();
 }

 // Update Shotgun gui
 // Shotgun gui is simply drawn with a bullet counter text
 if (shotgun) {
     shotgunGUI.text = shotgun.GetBulletsLeft().ToString();
 }

 // Update Grenade Launcher gui
 // Grenade Launcher gui is simply drawn with a bullet counter text
 if (grenadeLauncher) {
     grenadesGUI.text = grenadeLauncher.GetBulletsLeft().ToString();
 }

 // Update rocket gui
 // This is changed from the tutorial PDF. You need to assign the 20 Rocket textures found in the GUI/Rockets folder
 // to the RocketTextures property.
 if (rocketLauncher) {
     rocketGUI.UpdateRockets(rocketLauncher.ammoCount);
     /*if (rocketTextures.Length == 0) {
         Debug.LogError ("The tutorial was changed with Unity 2.0 - You need to assign the 20 Rocket textures found in the GUI/Rockets folder to the RocketTextures property.");
     } else {
         rocketGUI.texture = rocketTextures[rocketLauncher.ammoCount];
     }*/
 }