in `open': no implicit conversion of nil into String (TypeError) from ex30.rb:3:in `<main>'

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Subject	in `open': no implicit conversion of nil into String (TypeError) from ex30.rb:3:in `<main>'
From	Cai Gengyang <gengyangcai@gmail.com>
Injection-Date	Tue, 12 Apr 2016 03:31:15 +0000
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This is my file which I saved as ex30.rb :

filename = ARGV.first

txt = open(filename)

puts "Here's your file #{filename}:"
print txt.read

print "Type the filename again: "
file_again = $stdin.gets.chomp

txt_again = open(file_again)

print txt_again.read

This is the error I got when I tried to run it in my Terminal :

CaiGengYangs-MacBook-Pro:GoatBoy CaiGengYang$ ruby ex30.rb
ex30.rb:3:in `open': no implicit conversion of nil into String (TypeError)
	from ex30.rb:3:in `<main>'

What's the error here ?

Gengyang

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in `open': no implicit conversion of nil into String (TypeError)  from ex30.rb:3:in `<main>' Cai Gengyang <gengyangcai@gmail.com> - 2016-04-11 20:31 -0700
  Re: in `open': no implicit conversion of nil into String (TypeError) from ex30.rb:3:in `<main>' Robert Klemme <shortcutter@googlemail.com> - 2016-04-12 08:09 +0200
    Re: in `open': no implicit conversion of nil into String (TypeError) from ex30.rb:3:in `<main>' Cai Gengyang <gengyangcai@gmail.com> - 2016-04-12 22:34 -0700
      Re: in `open': no implicit conversion of nil into String (TypeError) from ex30.rb:3:in `<main>' Sebastian Christ <rudolfo.christ@gmail.com> - 2016-04-13 10:23 +0200
        Re: in `open': no implicit conversion of nil into String (TypeError) from ex30.rb:3:in `<main>' Cai Gengyang <gengyangcai@gmail.com> - 2016-04-13 09:08 -0700
          Re: in `open': no implicit conversion of nil into String (TypeError) from ex30.rb:3:in `<main>' Robert Klemme <shortcutter@googlemail.com> - 2016-04-13 20:27 +0200
            Re: in `open': no implicit conversion of nil into String (TypeError) from ex30.rb:3:in `<main>' Cai Gengyang <gengyangcai@gmail.com> - 2016-04-14 21:59 -0700

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