title: find_spec_for_exe': can't find gem bundler (>= 0.a) (Gem::GemNotFoundException)
body: <p>I used <code>sudo bundle install</code> and that might be the cause of the issue? </p>
  
  <p>Now I have:</p>
  
  <ul>
  <li><code>gem -v</code> 2.6.14</li>
  <li><code>ruby -v</code> ruby 2.3.5p376 (2017-09-14 revision 59905) [x86_64-darwin15]</li>
  <li><code>jekyll -v</code> jekyll 3.6.2</li>
  <li><code>bundle -v</code>Bundler version 1.16.0.pre.3</li>
  </ul>
  
  <p>I'm getting the following error when trying to run <code>bundle exec jekyll serve</code> or just <code>jekyll serve</code></p>
  
  <pre><code>/Users/myusername/.rvm/rubies/ruby-2.3.5/lib/ruby/site_ruby/2.3.0/rubygems.rb:271:in `find_spec_for_exe': can't find gem bundler (&gt;= 0.a) (Gem::GemNotFoundException)
      from /Users/myusername/.rvm/rubies/ruby-2.3.5/lib/ruby/site_ruby/2.3.0/rubygems.rb:299:in `activate_bin_path'
      from /Users/myusername/.rvm/gems/ruby-2.3.5/bin/bundle:23:in `&lt;main&gt;'
      from /Users/myusername/.rvm/gems/ruby-2.3.5/bin/ruby_executable_hooks:15:in `eval'
      from /Users/myusername/.rvm/gems/ruby-2.3.5/bin/ruby_executable_hooks:15:in `&lt;MacBooMacBook-MacBook-MacBook-Pro-MacBook-PrMacBook-MacBooMacBMaMacBMaMaMaMaMaMaMaMaMacBMaMaMaMacBMa
  </code></pre>
  
  <p>Also, when accessing the folder in which I have my blog <code>cd my_path</code> I get the following message:</p>
  
  <blockquote>
    <p>VM used your Gemfile for selecting Ruby, it is all fine - Heroku does that too,
    you can ignore these warnings with 'rvm rvmrc warning ignore /Library/WebServer/Documents/blog/Gemfile'.
    To ignore the warning for all files run 'rvm rvmrc warning ignore allGemfiles'.
    Unknown ruby interpreter version (do not know how to handle): RUBY_VERSION.</p>
  </blockquote>
  
  <p>I've no idea how to solve this. I just want to create my static blog and honestly I have no idea about Ruby, Gem or Bundle :) So I would appreciate some insights!</p>