title: I can't knit HTML on R Markdown. Can anyone please assist?
body: <p>The error that I get is:</p>
  
  <pre><code>processing file: 1.Rmd
  Error in loadNamespace(i, c(lib.loc, .libPaths()), versionCheck = vI[[i]]) : 
    there is no package called 'stringi'
  Calls: &lt;Anonymous&gt; ... tryCatch -&gt; tryCatchList -&gt; tryCatchOne -&gt; &lt;Anonymous&gt;
  Execution halted
  </code></pre>
  
  <p>I've tried installing the <code>stringi</code> package and loading it using the library function. But I still get the error.</p>
  
  <p>I use R Studio Version 0.99.441 on on Mac OS X 10.6.8.</p>