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From: Sebastian Christ <rudolfo.christ@gmail.com>
Newsgroups: comp.lang.ruby
Subject: Re: in `open': no implicit conversion of nil into String (TypeError) from ex30.rb:3:in `<main>'
Date: Wed, 13 Apr 2016 10:23:14 +0200
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On 2016-04-12 22:34, Cai Gengyang <gengyangcai@gmail.com> wrote:
 > What does "invoking the script without arguments" mean ? 

Are you sure that you've done all the exercises? You say you're now at Ex. 30,
but obviously you didn't pay that much attention to Ex. 13, did you?

Regards,
Sebastian

-- 
Sebastian (Rudolfo) Christ
http://rudolfochrist.github.io
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