title: Vagrant VM : Bad configuration option: IdentitiesOnly
body: <p>I installed the vagrant VM, but when i run:</p>
  
  <pre><code>vagrant ssh
  </code></pre>
  
  <p>it display an error of configuration:</p>
  
  <pre><code>command-line: line 0: Bad configuration option: IdentitiesOnly
  </code></pre>
  
  <p>I checked :</p>
  
  <pre><code>vagrant ssh-config
  </code></pre>
  
  <p>it display me:</p>
  
  <pre><code>C:\Vagrant\Ubuntu1&gt;vagrant ssh-config
  Host default
    HostName 127.0.0.1
    User vagrant
    Port 2222
    UserKnownHostsFile /dev/null
    StrictHostKeyChecking no
    PasswordAuthentication no
    IdentityFile C:/Vagrant/Ubuntu1/.vagrant/machines/default/virtualbox/private_key
    IdentitiesOnly yes
    LogLevel FATAL
  </code></pre>
  
  <p>Can you tell me why, knowing that the first time i'm using vagrant.</p>