title: Why is RSelenium always giving an error when I want to define a Firefox profile
body: <p>I am using RSelenium and want to set a Firefox profile. So I tried to reproduce the example of the answer to <a href="https://stackoverflow.com/questions/29759438/rselenium-popup?rq=1">this question</a>. However, no matter what I change I always get the following error. What am I doing wrong?</p>
  
  <p>I already read in the RSelenium manual that for windows systems RTools should be installed when one wants to make a Firefox profile. I did but nothing changed.</p>
  
  <p>The error is the following:</p>
  
  <pre><code>Error in file(tmpfile, "rb") : cannot open the connection
  In addition: Warning messages:
  1: running command '"zip" -r9Xjq "C:\Users\mariu\AppData\Local\Temp\RtmpQfl3bl\file15c41fc2411d.zip" "C:\Users\mariu\AppData\Local\Temp\RtmpQfl3bl/firefoxprofile/prefs.js" ' had status 127 
  2: In file(tmpfile, "rb") :
    cannot open file 'C:\Users\mariu\AppData\Local\Temp\RtmpQfl3bl\file15c41fc2411d.zip': No such file or directory
  </code></pre>