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copied!<p>You are forcing the Apple-installed Ruby to run, which is Ruby 1.8.7:</p> <pre><code>#!/usr/bin/ruby -w </code></pre> <p>instead of one of your Rubies managed by RVM. Try:</p> <pre><code>#!/usr/bin/env ruby -w </code></pre> <p>That way, if you want your system Ruby to run the code, you can tell RVM to switch to it:</p> <pre><code>rvm use system </code></pre> <p>and it will respond with: <code>Now using system ruby.</code> Alternately, you can use any of the RVM managed Rubies to run the code:</p> <pre><code>rvm 1.8.7 </code></pre> <p>if you had RVM install an instance of 1.8.7, or</p> <pre><code>rvm 1.9.2 </code></pre> <p>or</p> <pre><code>rvm default </code></pre> <p>if you set up a default Ruby for RVM, which is always a good idea:</p> <pre><code>rvm use 1.9.2 --default </code></pre> <p>You can check to see what versions of Ruby RVM has under its control:</p> <pre><code>$ rvm list rvm rubies ruby-1.8.7-p334 [ x86_64 ] => ruby-1.9.2-p180 [ x86_64 ] </code></pre> <p>Now, moving to your actual code, you have a bug. When trying to retrieve the price for an item you're looking for the wrong CSS, not finding the price node, getting a <code>nil</code> value, then trying to get the <code>text</code> from it. Use this instead:</p> <pre><code>price = item.at_css(".camelPrice").text[/\$[0-9\.]+/] </code></pre> <p>Your output will look similar to:</p> <pre> Fisher-Price Power Wheels Batman Lil Quad Ride-On - $59.97 /ip/Fisher-Price-Batman-Lil-Quad/10098697 </pre> <p>After making the change to the <code>#!</code> line, and the fix to the <code>price</code> line, I ran your code using Ruby 1.8.7 in my system, along with RVM controlled 1.8.7 and 1.9.2 with no problems.</p>

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