title: Error in texi2dvi running knitr::knit2pdf
body: <p>If I run </p>
  
  <pre><code>knit2pdf("test.Rnw")
  </code></pre>
  
  <p>...on a .Rnw file using <code>knitr</code> in R, I get this error:</p>
  
  <pre><code>Error in texi2dvi(file = file, pdf = TRUE, clean = clean, quiet = quiet,  : 
    Running 'texi2dvi' on 'test.tex' failed.
  </code></pre>
  
  <p>Anyone know how I can resolve?</p>