title: Error loading a workbook with openxlsx in R
body: <p>I am trying to open an xlsx workbook that one of my colleague sent me with R. </p>
  
  <p>But when try to load it using the <code>loadworkbook</code> function of the pkg <code>openxlsx</code>, it returns me the following error:</p>
  
  <pre><code>Error in fills[[fillId]]$fgColor : 
    $ operator is invalid for atomic vectors
  </code></pre>
  
  <p>Does anyone know where this error comes from?</p>
  
  <p>Thanks </p>
  
  <p>Pierryves</p>