title: IOError: wkhtmltopdf exited with non-zero code 127. error: [blank]
body: <p>I have been attempting to use <code>pdfkit/wkhtmltopdf</code>, but when I use it, I get the following error:</p>
  
  <pre><code>"IOError: wkhtmltopdf exited with non-zero **code** **127**. error:"
  
  File "/usr/local/lib/python2.7/dist-packages/pdfkit/pdfkit.py", line 119, in to_pdf
      raise IOError("wkhtmltopdf exited with non-zero code {0}. error:\n{1}".format(exit_code, stderr.decode("utf-8")))
  IOError: wkhtmltopdf exited with non-zero code 127. error:
  </code></pre>