Forum: FXRuby path for classes called with require

I'm working through the 'picturebook.rb' example in "FXRuby Create Lean
and Mean GUIs with Ruby" and got stuck embarrassingly early in the book.
I'm good up to the point that a blank window pops up (p 28).  When I
proceed to add the other classes (p 30), errors result.  The program
runs fine as shown, but when the commented lines are uncommented an
error message is shown (below).

Code that replicates p 30 with four lines commented out:

require 'fox16'

include Fox

#require 'photo'
#require 'photo_view'

class PictureBook < FXMainWindow
    def initialize(app)
        super(app, "Picture Book", :width => 600, :height => 400)
        #photo = Photo.new("bridge damage10.jpg")
        #photo_view = PhotoView.new(self, photo)
    end

    def create
        super
        show(PLACEMENT_SCREEN)
    end
end

if __FILE__ == $0
    FXApp.new do |app|
        PictureBook.new(app)
        app.create
        app.run
    end
end

Error message:

C:/Ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in
'gem_original_require': no such file to load -- photo (LoadError)

from C:/Ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31: in
'require'

from C:/Ruby/myscripts/picturebook/picturebook.rb:5

It seems like the fix would be to path the files so FXRuby can find
them, but I don't know what path that would be?

Thanks,
Jessica

After reading 7.6 in "The Ruby Programming Language" I know what path is 
searched first.  I was running the program with an absolute path, so the 
other files were not found.  Now I'm getting a different error:

C:/Ruby/lib/ruby/site_ruby/1.8/fox16/kwargs.rb:1193:in 'old_initialize':
 wrong argument type Photo (expected Data) (TypeError)

The error output continues.