Toggle MouseLook On/Off Problem

I have a problem with the MouseLook script. When i press Esc the pause menu comes up but i cant disable the FPS-MouseLook. I have the JS version of MouseLook. I set the script on Main Camera and FPS Controller. But it says:

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NullReferenceException: Object reference not set to an instance of an object 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) MouseDisable.Update () (at Assets/Scripts/MouseDisable.js:6)

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This is the script i wrote, please help?

 function Update () 
 { 
 
     if(Input.GetKeyDown("escape"))
     {
         GetComponent("MouseLook").enabled = !GetComponent("MouseLook").enabled;
     }
     
 }