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I have a problem getting find.rb and fileutils.rb to coexist in the same script. When I require both I get the following: /usr/lib/ruby/1.8/find.rb:36:in `dup'': can''t dup NilClass (TypeError) from /usr/lib/ruby/1.8/find.rb:36:in `find'' from /usr/lib/ruby/1.8/find.rb:36:in `find'' I googled for this problem and did not come across any place