Scene Won't Change

[Xilef]

I'm using Mr. Moo's Window/Scene Wizard to make, well, some windows and some scenes. I'm having problems with this:

  #--------------------------------------------------------------------------
  # * Update list47136452 
  #--------------------------------------------------------------------------
  def update_list47136452
    # If B button was pressed
    if Input.trigger?(Input::B)
      # Play cancel SE
      $game_system.se_play($data_system.cancel_se)
      return
    end
    # If C button was pressed
    if Input.trigger?(Input::C)
      # Branch by command window cursor position
[COLOR=Red]line98--->[/COLOR] case @command_window.index
      when 0 # Slot 1
      # Play decision SE
      $game_system.se_play($data_system.decision_se)
      # Switch to save screen
      $scene = Scene_Save.new
      when 1 # Slot 2
      
      end
    end
  end

I test play, start the script, but when I select Slot 1 it comes up with this error:

Script 'Scene_Memory' line 98: NoMethodError occurred.
undefined method 'index' for nil:NilClass

The red writing above indicates line 98 of Scene_Memory.
What am I doing wrong please?

If you need to see the rest of the script, then please tell me.

 

[verballydecapitating]

Well @command_window is uninitialized, give us the whole scene please.

 

[Chaosg1]

you haven't defined @command_window, make sure you define command_window.

 

[Xilef]

Spoiler: Whole script

#==============================================================================
# Scene_Memory
#==============================================================================
class Scene_Memory
  #--------------------------------------------------------------------------
  # * Main - Handles drawing/disposing windows and the main loop 
  #--------------------------------------------------------------------------
  def main
    #Draw Windows
    main_draw
    #Execute transition
    Graphics.transition
    #Main Loop
    loop do
      #Main Loop
      main_loop
      break if main_scenechange?
    end
    #Prepare for transition
    Graphics.freeze
    #Dispose Windows
    main_dispose
  end
  #--------------------------------------------------------------------------
  # * Main Draw - Handles drawing windows
  #--------------------------------------------------------------------------
  def main_draw
    #Draw Windows
    # Slot2
    @Slot2 = Slot2.new
    # Slot1
    @Slot1 = Slot1.new
    # Select
    @Select = Select.new
    # List47136452
    @list47136452 = Pre_Command.new(110,['Slot 1','Slot 2',],21)
    @list47136452.windowskin = RPG::Cache.windowskin('001-Blue01')
    @list47136452.x = 10
    @list47136452.y = 16
  end
  #--------------------------------------------------------------------------
  # * Main Scene Change 
  #--------------------------------------------------------------------------
  def main_scenechange?
    # Abort loop if screen is changed
    if $scene != self
      return true
    end
    return false
  end
  #--------------------------------------------------------------------------
  # * Main Dispose 
  #--------------------------------------------------------------------------
  def main_dispose
    # Dispose All Windows
    # Dispose Slot2
    @Slot2.dispose
    # Dispose Slot1
    @Slot1.dispose
    # Dispose Select
    @Select.dispose
    # Dispose List47136452
    @list47136452.dispose
  end
  #--------------------------------------------------------------------------
  # * Main Loop 
  #--------------------------------------------------------------------------
  def main_loop
    # Update game screen
    Graphics.update
    # Update input information
    Input.update
    # Frame update
    update
  end
  #--------------------------------------------------------------------------
  # * Update 
  #--------------------------------------------------------------------------
  def update
    # Update Windows
    update_windows
    #Update list47136452
    update_list47136452 if @list47136452.active and @list47136452.visible
  end
  #--------------------------------------------------------------------------
  # * Update list47136452 
  #--------------------------------------------------------------------------
  def update_list47136452
    # If B button was pressed
    if Input.trigger?(Input::B)
      # Play cancel SE
      $game_system.se_play($data_system.cancel_se)
      return
    end
    # If C button was pressed
    if Input.trigger?(Input::C)
      # Branch by command window cursor position
      case @command_window.index
      when 0 # Slot 1
      # Play decision SE
      $game_system.se_play($data_system.decision_se)
      # Switch to save screen
      $scene = Scene_Save.new
      when 1 # Slot 2
      end
    end
  end
  #--------------------------------------------------------------------------
  # * Window Update 
  #--------------------------------------------------------------------------
  def update_windows
    # Update Slot2
    @Slot2.update if @Slot2.visible
    # Update Slot1
    @Slot1.update if @Slot1.visible
    # Update Select
    @Select.update if @Select.visible
    # Update List47136452
    @list47136452.update if @list47136452.visible
  end
end

How do you define it?
If you need to see the windows aswell, then I can get those.

 

[Mr.Mo]

thats my fault :P

replace @command_window with @list47136452

you mgiht actually want to rename the variables in the wizard.

 

[Xilef]

Ah. Kk. Shoulda PMed you first. Thanks!
Edit, Edit: Never mind, I found an easier way around it.