title: Error: zipping up workbook failed when trying to write.xlsx
body: <p>I was trying to write a xlsx file with <code>write.xlsx</code> and I get this error:
  </p>
  
  <pre class="lang-none prettyprint-override"><code>Error: zipping up workbook failed. Please make sure Rtools is installed or a zip application is available to R.
       Try installr::install.rtools() on Windows.
  
  package ‘Rtools’ is not available (for R version 3.1.2) 
  </code></pre>
  
  <p>What should I do now to fix this?</p>
  
  <p><strong>EDIT:</strong>
  I install Rtools:</p>
  
  <pre class="lang-none prettyprint-override"><code>&gt;installr::install.rtools()
  
  No need to install Rtools - You've got the relevant version of Rtools installed
  </code></pre>
  
  <p>but still I get that error after <code>write.xlsx</code></p>