title: Cannot start the server with gem acts_as_xlsx
body: <p>I cannot start the server after adding the gem "acts as xlsx" to my gemfile.</p>
  
  <p>I have read other posts on this problem but still haven't got a clue what is going on.   Most seem to have resolved the problem by removing the gem from the gemfile.   If I remove the gem, I can start the server but I need it to do what I want to do.  Also, I get the same message if I use the gem "axlsx" or "axlsx_rails", so I believe that something that is required in this gem is creating this issue.</p>
  
  <p>The error message is </p>
  
  <pre><code>"bin/rails:6: warning: already initialized constant APP_PATH /home/ubuntu/workspace/horsestud_app/bin/rails:6: warning: previous definition of APP_PATH was here
  Error: Command '-b' not recognized"
  </code></pre>
  
  <p>Thanking you in advance...</p>