HtmlAgilityPack cannot find specific td

I need extract value of just one specific td from the table by using XPath, but code always return null. How can I fix this?

var location = GetLocation(document.Result.DocumentNode.SelectSingleNode("//*[@id='detailTabTable']/tbody/tr[3]/td[2]"));

and the code

private string GetLocation(HtmlNode h)
        {
            try
            {
                string location = null;
                if (h == null)
                {
                    location = "N/A";
                }
                else
                {
                    location = h.InnerText;
                    location = location.Substring(0, location.IndexOf(",", StringComparison.InvariantCulture));
                }
                return location;
            }
            catch (Exception ex)
            {
                log.ErrorFormat("Error in Link Data Repository {0} in Parse Links {1}", ex.Message, ex.StackTrace);
                throw new Exception(ex.Message);
            }
        }

And small simple table:

       <table id="detailTabTable" width="99%" border="0" cellspacing="0" cellpadding="0">
            <tr>
                <td class="detailTabContentLt">Current List Price:</td>
                <td class="detailTabContentPriceRt">
                  <span class="aiDetailCurrentPrice">AED 6,600,000</span>
                </td>
            </tr>
            <tr>
                <td class="detailTabContentLt" style="white-space: nowrap;">Plot size (Sq. Ft.):</td>
                <td class="detailTabContentRt">N/A</td>
            </tr>
            <tr>
                <td class="detailTabContentLt" valign="top">Locality</td>
                <td class="detailTabContentRt">Dubai, Dubai</td>
            </tr>
            <tr>
                <td colspan="2"></td>
            </tr>
        </table>