Help iwth script (RGSS Player crash)

[LiTTleDRAgo]

Code:

class Scene_Zada
 #--------------------------------------------------------------------------
 # * Main Processing
 #--------------------------------------------------------------------------
 def main
   # Make help window, item window
   @help_window = Window_Zada2.new
   @item_window = Window_Zada.new
   # Associate help window
   @item_window.help_window = @help_window
   # Make target window (set to invisible / inactive)
   @target_window = Window_Target.new
   @target_window.visible = false
   @target_window.active = false
   @spriteset = Spriteset_Map.new
   # Execute transition
   Graphics.transition
   # Main loop
   loop do
     # Update game screen
     Graphics.update
     # Update input information
     Input.update
     # Frame update
     update
     # Abort loop if screen is changed
     if $scene != self
       break
     end
   end
   # Prepare for transition
   Graphics.freeze
   # Dispose of windows
   @help_window.dispose
   @item_window.dispose
   @target_window.dispose
   @spriteset.dispose # <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
 end
end