title: Install ruby with asdf on MacOS via Homebrew
body: <p>I recently wanted to install a different Version of ruby and Rails on MacOS Big Sur 11.5 Beta. I Installed asdf via Homebrew. I wanted to run rails server but got the Message:</p>
  <pre><code>No preset version installed for command ruby
  Please install a version by running one of the following:
  
  asdf install ruby 3.0.2
  
  or add one of the following versions in your config file at /Users/philippkorn/.tool-versions
  ruby 3.0.1
  </code></pre>
  <p>When I try to run any asdf install ruby command (i.e. <code>asdf install ruby latest</code>) I get the following error message:</p>
  <pre><code>~ $ asdf install ruby latest                                                                                                                                                            (base)
  Version not found
  </code></pre>
  <p>I tried reinstalling asdf with homebrew but the error persists...</p>