Fix

# // Dont cram your code together
class Window_Mine < Window_Base

  def initialize
    super( 0, 0, 320, 240 )
    actor = $game_actors[1]
    x, y = 5, 50
    draw_actor_face( actor, x, y )
  end

  # // Define your methods, outside other methods . x .
  def your_method
  end

end

class Scene_Mine < Scene_Base

  def start()
    super()
    @my_window = Window_Mine.new
  end

  def update()
    super()
    @my_window.update
    if Input.trigger?(Input::C)
      $scene = Scene_Map.new
    end
  end

  def terminate()
    super()
    @my_window.dispose
  end

end