I need help with an error - MissingFieldException: System.Single.Time

Error:

MissingFieldException: System.Single.Time Boo.Lang.Runtime.DynamicDispatching.PropertyDispatcherFactory.FindExtension (IEnumerable`1 candidates) Boo.Lang.Runtime.DynamicDispatching.PropertyDispatcherFactory.Create (SetOrGet gos) Boo.Lang.Runtime.DynamicDispatching.PropertyDispatcherFactory.CreateGetter () Boo.Lang.Runtime.RuntimeServices.DoCreatePropGetDispatcher (System.Object target, System.Type type, System.String name) Boo.Lang.Runtime.RuntimeServices.CreatePropGetDispatcher (System.Object target, System.String name) Boo.Lang.Runtime.RuntimeServices+c_AnonStorey17.<>m_C () Boo.Lang.Runtime.DynamicDispatching.DispatcherCache.Get (Boo.Lang.Runtime.DynamicDispatching.DispatcherKey key, Boo.Lang.Runtime.DynamicDispatching.DispatcherFactory factory) Boo.Lang.Runtime.RuntimeServices.GetDispatcher (System.Object target, System.String cacheKeyName, System.Type[] cacheKeyTypes, Boo.Lang.Runtime.DynamicDispatching.DispatcherFactory factory) Boo.Lang.Runtime.RuntimeServices.GetDispatcher (System.Object target, System.Object[] args, System.String cacheKeyName, Boo.Lang.Runtime.DynamicDispatching.DispatcherFactory factory) Boo.Lang.Runtime.RuntimeServices.GetProperty (System.Object target, System.String name) UnityScript.Lang.UnityRuntimeServices.GetProperty (System.Object target, System.String name)

Script:

 var Distance;
 var Target : Transform;
 var lookAtDistance = 25.0;
 var chaseRange = 15.0;
 var attackRange = 1.5;
 var moveSpeed = 5.0;
 var Damping = 6.0;
 var controller : CharacterController;
 var attackRepeateTime = 1;
 private var attackTime : float;
 
 
 
 var gravity : float = 20.0;
 private var MoveDirection : Vector3 = Vector3.zero;
  
 function start ()
 {
     attackTime = Time.time;
 }
 
 
 function Update ()
 {
     Distance = Vector3.Distance(Target.position,transform.position);
       
     if (Distance < lookAtDistance)
     {
         lookAt();
     } 
        
     if (Distance > lookAtDistance)
     {
         GetComponent.<Renderer>().material.color = Color.green;
     }
     
     if (Distance < attackRange)
     {
         attack();
     }
    else if (Distance < chaseRange)
     {
         chase ();
     }
 }
   
 function lookAt()
 {
     GetComponent.<Renderer>().material.color = Color.yellow;
     var rotation = Quaternion.LookRotation(Target.position - transform.position);
     transform.rotation = Quaternion.Slerp(transform.rotation, rotation, Time.deltaTime * Damping);
 }
   
 function chase()
 {
     GetComponent.<Renderer>().material.color = Color.red;
     MoveDirection = transform.forward;
     MoveDirection *= moveSpeed;
 
     MoveDirection.y -= gravity.Time.deltaTime;
     controller.Move(MoveDirection * Time.deltaTime);
 }
 
 function attack()
 {
     if (Time.time > attackTime)
     {
         Debug.Log("attack");
         attackTime = Time.time + attackRepeateTime;
     }
 }