ruby-on-rails - Tar2RubyScriptのエラー

Question

Railsアプリケーションの配布に関するこのハウツーに従っていました

http://www.erikveen.dds.nl/distributingrubyapplications/rails.html

しかし、私がする頃には：

$ ruby tar2rubyscript.rb desktopApp/

出力は次のとおりです。

tar2rubyscript.rb:623:in `replace': can't modify frozen String (RuntimeError)
        from tar2rubyscript.rb:623:in `block in <main>'
        from tar2rubyscript.rb:577:in `block in newlocation'
        from tar2rubyscript.rb:505:in `block in newlocation'
        from tar2rubyscript.rb:472:in `newlocation'
        from tar2rubyscript.rb:505:in `newlocation'
        from tar2rubyscript.rb:577:in `newlocation'
        from tar2rubyscript.rb:621:in `<main>'