Can someone explain this?? KeyCode Error

Im working a long time with Unity and i never have seen THIS error and i cant get rid of it no matter what i do... UnityException: Input Key named: KeyCode.E is unknown UnityEngine.Input.GetKeyDown (string) (wrapper dynamic-method) UnityEngine.Input.Input$GetKeyDown$System.String (object,object[]) Boo.Lang.Runtime.RuntimeServices.Invoke (object,string,object[]) Mouse.Update () (at Assets/Scripts/Mouse.js:9) basically im getting the "KeyCode.E" from another script so its like Input.GetKey(GameObject.Find(CONTROLS).GetComponent(CONTROLS).forward)