title: Rails uploading file with paperclip
body: <p>I want to upload a file with paperclip to amazon AWS S3.</p>
  
  <p>Running a Rails 4.2 app on debian</p>
  
  <p>But I got this error:</p>
  
  <pre><code>ERROR ArgumentError: could not find a temporary directory
  </code></pre>
  
  <p>how can I fix this?</p>