title: R Markdown not knitting due to rbind error
body: <p>I'm a new RMarkdown user trying to render a .Rmd file to Word and I haven't been able to get it to spit out anything at all.  Every time that I try to knit the file, I get the following error:</p>
  
  <pre><code>Error in rbind(info, getNamespaceInfo(env, "S3methods")) : 
    number of columns of matrices must match (see arg 2)
  Calls: :: ... tryCatch -&gt; tryCatchList -&gt; tryCatchOne -&gt; &lt;Anonymous&gt;
  Execution halted
  </code></pre>
  
  <p>I started by reinstalling the "knitr" and "evaluate" packages (the latter due to an answer to a separate question) and then pared down the code to just the bare bones:</p>
  
  <pre><code>---
  title: "Untitled"
  author: "Anonymous"
  output: word_document
  ---
  Test
  </code></pre>
  
  <p>Not even this small amount of code works, with each attempt to knit things together resulting in the same error as above.</p>
  
  <p>What am I missing?</p>