title: R readHTMLTable: Error failed to load external entity
body: <p>I am trying to read a HTML table using the XML command <code>readHTMLTable</code>. It is information about options in the Eurex page. When i run the code: </p>
  
  <pre><code>info&lt;-readHTMLTable("http://www.eurexchange.com/action/exchange-en/155392-31606/31608/quotesSingleViewOption.do?callPut=Call&amp;maturityDate=201312",which=1)
  </code></pre>
  
  <p>I get this error message:</p>
  
  <pre><code>Error: failed to load external entity "http://www.eurexchange.com/action/exchange-en/155392-31606/31608/quotesSingleViewOption.do?callPut=Call&amp;maturityDate=201312"
  </code></pre>
  
  <p>I have the correct packages installed and the last r version.</p>
  
  <p>Does anybody know what could be the problem?</p>
  
  <p>Thank you</p>