Modified Machine Gun Script Error

private var bulletsLeft : int = 0; private var nextFireTime = 0.0; private var m_LastFrameShot = -1;

function Start() { var direction = transform.TransformDirection(Vector3.forward); var hit : RaycastHit; if (Physics.Raycast (transform.position, direction, hit, range)){ print ("I'm looking at " + hit.transform.name); } else { print ("I'm looking at nothing!"); } DirtParticles = DirtEmitter.GetComponent(ParticleEmitter); BloodParticles = BloodEmitter.GetComponent(ParticleEmitter); SparkParticles = SparkEmitter.GetComponent(ParticleEmitter);

 // We don't want to emit particles all the time, only when we hit something.
 if (DirtParticles)
     DirtParticles.emit = false;



 // We don't want to emit particles all the time, only when we hit something.
 if (BloodParticles)
     BloodParticles.emit = false;



 // We don't want to emit particles all the time, only when we hit something.
 if (SparkParticles)
     SparkParticles.emit = false;
 bulletsLeft = bulletsPerClip;

}

function LateUpdate() { if (muzzleFlash) { // We shot this frame, enable the muzzle flash if (m_LastFrameShot == Time.frameCount) { muzzleFlash.transform.localRotation = Quaternion.AxisAngle(Vector3.forward, Random.value); muzzleFlash.enabled = true;

         if (audio)
         {
             if (!audio.isPlaying)
                 audio.Play();
             audio.loop = true;
         }
     }
     // We didn't, disable the muzzle flash
     else
     {
         muzzleFlash.enabled = false;
         enabled = false;

         // Play sound
         if (audio)
         {
             audio.loop = false;
         }
     }
 }

}

function Fire () { if (bulletsLeft == 0) return;

 // If there is more than one bullet between the last and this frame
 // Reset the nextFireTime
 if (Time.time - fireRate > nextFireTime)
     nextFireTime = Time.time - Time.deltaTime;

 // Keep firing until we used up the fire time
 while( nextFireTime < Time.time && bulletsLeft != 0)
 {
     FireOneShot();
     nextFireTime += fireRate;
 }

}

function FireOneShot (){

     DirtParticles = DirtEmitter.GetComponent(ParticleEmitter);
    BloodParticles = BloodEmitter.GetComponent(ParticleEmitter);
     SparkParticles = SparkEmitter.GetComponent(ParticleEmitter);
 var direction = transform.TransformDirection(Vector3.forward);
 var hit : RaycastHit;

 // Did we hit anything?
 if (Physics.Raycast (transform.position, direction, hit, range))
 {
     // Apply a force to the rigidbody we hit
     if (hit.rigidbody)
         hit.rigidbody.AddForceAtPosition(force * direction, hit.point);

     // Place the particle system for spawing out of place where we hit the surface!
     // And spawn a couple of particles
     if (DirtParticles&&hit.collider.transform.CompareTag("Ground"))
     {
         DirtParticles.transform.position = hit.point;
         DirtParticles.transform.rotation = Quaternion.FromToRotation(Vector3.up, hit.normal);
         DirtParticles.Emit();
     }
     if (BloodParticles&&hit.collider.transform.CompareTag("alienZombie"))
     {
         BloodParticles.transform.position = hit.point;
         BloodParticles.transform.rotation = Quaternion.FromToRotation(Vector3.up, hit.normal);
         BloodParticles.Emit();
     }
    if (SparkParticles&&hit.collider.transform.CompareTag("Metal"))
     {
         SparkParticles.transform.position = hit.point;
         SparkParticles.transform.rotation = Quaternion.FromToRotation(Vector3.up, hit.normal);
         SparkParticles.Emit();
     }
     // Send a damage message to the hit object          
     hit.collider.SendMessageUpwards("ApplyDamage", damage, SendMessageOptions.DontRequireReceiver);
 }

 bulletsLeft--;

 // Register that we shot this frame,
 // so that the LateUpdate function enabled the muzzleflash renderer for one frame
 m_LastFrameShot = Time.frameCount;
 enabled = true;

 // Reload gun in reload Time        
 if (bulletsLeft == 0)
     Reload();           

}

function Reload () {

 // Wait for reload time first - then add more bullets!
 yield WaitForSeconds(reloadTime);

 // We have a clip left reload
 if (clips > 0)
 {
     clips--;
     bulletsLeft = bulletsPerClip;
 }

}