title: RVM bundler installed ERROR: Gem bundler is not installed, run `gem install bundler` first
body: <p>I get to work with a new project and it's based on ruby 1.8.7, I'm using rvm to manage my ruby versions and I have installed 1.8.7 and 1.9.2.</p>
  
  <p>The thing is when I do:</p>
  
  <pre><code>rvm use 1.8.7 
  </code></pre>
  
  <p>and try to run:</p>
  
  <pre><code>bundle install
  </code></pre>
  
  <p>I get:</p>
  
  <pre><code>ERROR: Gem bundler is not installed, run `gem install bundler` first.
  </code></pre>
  
  <p>I've installed bundler 5 times and even after that it says it's not installed. What can cause this? Bundle even shows up at my gem list.</p>
  
  <p><strong>update from comments:</strong></p>
  
  <p>The ouput of the which ruby &amp;&amp; which gem is:</p>
  
  <pre><code>/home/username/.rvm/rubies/ruby-1.8.7-p371/bin/ruby
  /home/username/.rvm/bin/gem
  </code></pre>
  
  <p>Output of "env | grep -iE 'ruby|rvm|gem' | sort":</p>
  
  <pre><code>GEM_HOME=/home/username/.rvm/gems/ruby-1.8.7-p371@global
  GEM_PATH=/home/username/.rvm/gems/ruby-1.8.7-p371@global
  IRBRC=/home/username/.rvm/rubies/ruby-1.8.7-p371/.irbrc
  MY_RUBY_HOME=/home/username/.rvm/rubies/ruby-1.8.7-p371
  PATH=/home/username/.rvm/gems/ruby-1.8.7-p371@global/bin:/home/username/.rvm/rubies/ruby-1.8.7-p371/bin:/home/username/.rvm/bin:/usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games
  RUBY_VERSION=ruby-1.8.7-p371
  rvm_bin_path=/home/username/.rvm/bin
  rvm_delete_flag=0
  rvm_path=/home/username/.rvm
  rvm_prefix=/home/username
  rvm_ruby_string=ruby-1.8.7-p371
  rvm_sticky_flag=1
  rvm_use_flag=1
  rvm_version=1.17.7 (stable)
  </code></pre>
  
  <p><strong>Unistalled and installed 1.8.7 via RVM</strong>
  ran:</p>
  
  <pre><code>rvm install 1.8.7 --verify-downloads 1
  </code></pre>
  
  <p>and it worked.</p>