NoMethodError: undefined method `width' for nil:NilClass

droidemo_activity.rb

require 'ruboto/activity'
require 'ruboto/widget'
require 'ruboto/util/toast'

ruboto_import_widgets :Button, :TextView, :RelativeLayout

$activity.start_ruboto_activity "$sample_activity" do
  setTitle 'Droidemo: A Ruboto Experiment'

  def on_create(bundle)
    self.content_view =
      relative_layout(:id => 41, :layout => {:width= => :fill_parent}) do
        @text_view = text_view :id     => 42,
                               :text   => 'Greetings, Outlander.'
        @button    = button    :id     => 43,
                               :text   => "Pickpocket this NPC",
                               :width  => :wrap_content, 
                               :on_click_listener => @pick_pocket
      end
    #end 
  end

  @pick_pocket = proc do |view|
    @text_view.text = 'Guards! Arrest this thief.'
    @button.text    = 'Activate Stealth'
    toast '24 Gold added.'
    @button.on_click_listener = @activate_stealth
  end
  
  @activate_stealth = proc do |view|
    @text_view.text = "Hey! Where'd he go?"
    @button.text    = "Pickpocket this NPC"
    toast 'You disappear into nearby shadows.'
    @button.on_click_listener = @pick_pocket
  end
end