title: Double-Spacing an ACM Proceedings Article in LaTeX
body: <p>I am using the <a href="http://www.acm.org/sigs/publications/acm_proc_article-sp.cls" rel="noreferrer">acm LaTeX template</a> and I have trouble making my paper double spaced.</p>
  
  <p>My LaTeX document looks like the following:</p>
  
  <pre><code>\documentclass{acm_proc_article-sp}
  \usepackage{setspace}
  \doublespacing
  \begin{document}
  ...
  \end{document}
  </code></pre>
  
  <p>When I compile the above document using pdflatex, I get the following error message on the line that I use the command <code>\doublespacing</code>:</p>
  
  <pre><code>Missing number, treated as zero \doublespacing
  </code></pre>