Goal: Print "HelloGame!" to the center of a window. Syntax errors are on lines 23 and 28 when code is ran.

gistfile1.txt

require 'gosu'

class Hello < Gosu::Window

    def initialize (width = 800, height = 600, fullscreen = false)
        super
        self.caption = "HelloGame!"
        @image = Gosu::Image.from_text self, "HelloGame!",
                                    Gosu.default_font_name,
                                    100
    end

    def button_down id
        close if id == Gosu::KbEscape
    end

    def update
        @x = self.width/2 - @image.width/2
        @y = self.height/2 - @image.height/2
    end

    def draw
        @image.draw (@x, @y, 0)
    end

end

Hello.new.show