Ruby on Rails

I am getting TypeError: can't convert String into Integer, I found duplicate answer too, but I am facing this error for 'pack'.

Other confusion is, it is working fine with ruby 1.8.7, not with ruby 1.9.3, here is the code

irb(main):003:0> length=nil
=> nil
irb(main):004:0> token_string ||= ["A".."Z","a".."z","0".."9"].collect { |r| r.to_a }.join + %q(!$:*)
=> "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789!$:*"
irb(main):005:0> token =  (0..(length ? length : 60)).collect { token_string[rand( token_string.size)]}.pack("c*")
TypeError: can't convert String into Integer
    from (irb):5:in `pack'
    from (irb):5
    from /home/appandya/.rvm/rubies/ruby-1.9.3-p374/bin/irb:13:in `<main>'
irb(main):006:0>

Ant Ideas?

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