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    <p>I've had similar issues on OS X. Mainly because of different versions of Ruby installed. Or the built-in version fighting with versions I've installed myself. </p> <p>Things to check:</p> <p><ol> <li>type <code>which ruby</code> in a terminal</li> <li>does the output make sense with what you have installed?</li> <li>are you using any Ruby managers (like <a href="https://rvm.io//" rel="nofollow">rvm</a> or <a href="https://github.com/sstephenson/rbenv/" rel="nofollow">rbenv</a>)?</li> <li>if so, check your paths in <code>/.bash_profile</code> or <code>/.bashrc</code> to see where they point. <a href="http://kakubei.blogspot.com.es/2012/04/ruby-managers.html" rel="nofollow">This link</a> might help with installing and configuring rbenv.</li> <li>I use rbenv so I have this in my <code>bash_profile</code> before any other <strong>$PATH</strong> declarations to make sure it grabs those executables first:</p> <blockquote> <p>export PATH="$HOME/.rbenv/bin:$PATH"</li> <li>what does <code>gem env</code> say? Is it the right path?</li> <li>I run Ruby 1.9.3 locally but have to deal with 1.8.7 remotely because of issues with our hosting company so I have both versions installed locally. I forget to update the <code>bundle install</code> for the right version of Ruby command and scratch my head when I get errors like the one you are seeing. Hopefully you don't have this problem, but I'm just pointing it out in case it leads you down the right path. </li> <li>does <code>bundle exec rails console</code> or <code>bundle exec rails server</code> do the same thing as <code>rails console</code> and <code>rails server</code> respectively?</li> <li>If they don't, where are you installing the bundles? Simply <code>bundle install</code> or <code>bundle install --path vendor/bundle</code>?</li> </ol> Hopefully some of this will help you pinpoint the problem. </p> </blockquote> <p>If you're getting desperate, remove the built-in version of Ruby and install a fresh version with either rvm or rbenv (I prefer rbenv after having lots of problems with rvm) and try again to see if that works. </p>
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