I'm trying to simply add 200 to index, but am getting the error:
"`initialize': undefined method `+' for #<NumNode:0x82537b4 @num=2>
(NoMethodError)"
Any thoughts on how I can fix this?

class StoreNode < UnaryNode
  def initialize(subTree, index)
    super(subTree)
    @theIndex = index + 200
  end

  def evaluate()
    i = @subTree.evaluate()
    $calc.out.write("M[")
    $calc.out.write(@theIndex)
    $calc.out.write("]:= M[sp + 0]\n")
  end
end

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