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[Resolved]Help! "Window_Selectable" error

Here is my script:
Code:
#===================================================
# - Djzalzer's Custom Menu by Djzalzer
#===================================================
class Scene_Menu
  
#---------------------------------------------------------------------------------
  def initialize
  end
#---------------------------------------------------------------------------------

class Scene_Menu
  #--------------------------------------------------------------------------
  # * Object Initialization
  #     menu_index : command cursor's initial position
  #--------------------------------------------------------------------------
  def initialize(menu_index = 0)
    @menu_index = menu_index
  end
  #--------------------------------------------------------------------------
  # * Main Processing
  #--------------------------------------------------------------------------
  def main
    # Make command window
    s1 = $data_system.words.item
    s2 = $data_system.words.skill
    s3 = $data_system.words.equip
    s4 = "Status"
    s5 = "Save"
    s6 = "End Game"
    @command_window = Window_Command.new(160, [s1, s2, s3, s4, s5, s6])
    @command_window.index = @menu_index
    # If number of party members is 0
    if $game_party.actors.size == 0
      # Disable items, skills, equipment, and status
      @command_window.disable_item(0)
      @command_window.disable_item(1)
      @command_window.disable_item(2)
      @command_window.disable_item(3)
    end
    # If save is forbidden
    if $game_system.save_disabled
      # Disable save
      @command_window.disable_item(4)
    end
    # Make play time window
    @windowgold = Window_Gold.new
    @windowgold.x =0
    @windowgold.y =249
    @windowgold.height = 231
    @windowgold.width = 161
   
    @windowlocation = Window_Location.new
    @windowlocation.x =131
    @windowlocation.y =405
    @windowlocation.height = 75
    @windowlocation.width = 509
   
    @windowstatus = Window_MenuStatus.new
    @windowstatus.x =160
    @windowstatus.y =0
    @windowstatus.height = 406
    @windowstatus.width = 480
    # 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
    @windowgold.dispose
    @windowlocation.dispose
    @windowstatus.dispose
  end
  #--------------------------------------------------------------------------
  # * Frame Update
  #--------------------------------------------------------------------------
  def update
    # Update windows
    @windowgold.update
    @windowlocation.update
    @windowstatus.update
    # If command window is active: call update_command
    if @command_window.active
      update_command
      return
    end
    # If status window is active: call update_status
    if @windowstatus.active
      update_status
      return
    end
  end
  #--------------------------------------------------------------------------
  # * Frame Update (when command window is active)
  #--------------------------------------------------------------------------
  def update_command
    # If B button was pressed
    if Input.trigger?(Input::B)
      # Play cancel SE
      $game_system.se_play($data_system.cancel_se)
      # Switch to map screen
      $scene = Scene_Map.new
      return
    end
    # If C button was pressed
    if Input.trigger?(Input::C)
      # If command other than save or end game, and party members = 0
      if $game_party.actors.size == 0 and @command_window.index < 4
        # Play buzzer SE
        $game_system.se_play($data_system.buzzer_se)
        return
      end
      # Branch by command window cursor position
      case @command_window.index
      when 0  # item
        # Play decision SE
        $game_system.se_play($data_system.decision_se)
        # Switch to item screen
        $scene = Scene_Item.new
      when 1  # skill
        # Play decision SE
        $game_system.se_play($data_system.decision_se)
        # Make status window active
        @command_window.active = false
        @windowstatus.active = true
        @windowstatus.index = 0
      when 2  # equipment
        # Play decision SE
        $game_system.se_play($data_system.decision_se)
        # Make status window active
        @command_window.active = false
        @windowstatus.active = true
        @windowstatus.index = 0
      when 3  # status
        # Play decision SE
        $game_system.se_play($data_system.decision_se)
        # Make status window active
        @command_window.active = false
        @windowstatus.active = true
        @windowstatus.index = 0
      when 4  # save
        # If saving is forbidden
        if $game_system.save_disabled
          # Play buzzer SE
          $game_system.se_play($data_system.buzzer_se)
          return
        end
        # Play decision SE
        $game_system.se_play($data_system.decision_se)
        # Switch to save screen
        $scene = Scene_Save.new
      when 5  # end game
        # Play decision SE
        $game_system.se_play($data_system.decision_se)
        # Switch to end game screen
        $scene = Scene_End.new
      end
      return
    end
  end
  #--------------------------------------------------------------------------
  # * Frame Update (when status window is active)
  #--------------------------------------------------------------------------
  def update_status
    # If B button was pressed
    if Input.trigger?(Input::B)
      # Play cancel SE
      $game_system.se_play($data_system.cancel_se)
      # Make command window active
      @command_window.active = true
      @windowstatus.active = false
      @windowstatus.index = -1
      return
    end
    # If C button was pressed
    if Input.trigger?(Input::C)
      # Branch by command window cursor position
      case @command_window.index
      when 1  # skill
        # If this actor's action limit is 2 or more
        if $game_party.actors[@status_window.index].restriction >= 2
          # Play buzzer SE
          $game_system.se_play($data_system.buzzer_se)
          return
        end
        # Play decision SE
        $game_system.se_play($data_system.decision_se)
        # Switch to skill screen
        $scene = Scene_Skill.new(@status_window.index)
      when 2  # equipment
        # Play decision SE
        $game_system.se_play($data_system.decision_se)
        # Switch to equipment screen
        $scene = Scene_Equip.new(@status_window.index)
      when 3  # status
        # Play decision SE
        $game_system.se_play($data_system.decision_se)
        # Switch to status screen
        $scene = Scene_Status.new(@status_window.index)
      end
      return
    end
  end
end
#---------------------------------------------------------------------------------

#---------------------------------------------------------------------------------
  def update
  end
#---------------------------------------------------------------------------------

end
#===================================================
# - CLASS Scene_Menu Ends
#===================================================  



#===================================================
# - CLASS Window_Gold Begins
#===================================================

class Window_Gold < Window_Base

#---------------------------------------------------------------------------------     
  def initialize
    super(0, 0, 161,231)
    self.contents = Bitmap.new(width - 32, height - 32)
    self.contents.font.name = "Tahoma"
    self.contents.font.size = 22
    self.contents.font.color = text_color(0)
    self.contents.draw_text(0, 0, 33, 33, "Gold & Playtime")
  end
#---------------------------------------------------------------------------------   

end
#===================================================
# - CLASS Window_Gold Ends
#===================================================


#===================================================
# - CLASS Window_Loaction Begins
#===================================================

class Window_Location < Window_Base

#---------------------------------------------------------------------------------     
  def initialize
    super(0, 0, 509,75)
    self.contents = Bitmap.new(width - 32, height - 32)
    self.contents.font.name = "Tahoma"
    self.contents.font.size = 22
    self.contents.font.color = text_color(0)
    self.contents.draw_text(0, 0, 33, 33, "Location Window")
  end
#---------------------------------------------------------------------------------   

end
#===================================================
# - CLASS Window_Location Ends
#===================================================
When I run it I get this error:
Stupid Error said:
Script 'Window_Selectable' line 102: NoMethodError occured.

undefined method '<' for nil:NilClass

The line that has the error is:

Code:
  #--------------------------------------------------------------------------
  # * Update Cursor Rectangle
  #--------------------------------------------------------------------------
  def update_cursor_rect
    # If cursor position is less than 0
    [color=red]if @index < 0[/color]
      self.cursor_rect.empty
      return
    end
    # Get current row
    row = @index / @column_max
    # If current row is before top row
    if row < self.top_row
      # Scroll so that current row becomes top row
      self.top_row = row
    end
Help? Please? For a newbie's sake?

Edited to highlight script error line.
 

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