Hi,,,,  I been trying to perform an upgrade from 4.7 to 5.2.3 - everything appeared to go ok, but when I try and browse to the site, I am getting the following error.  I did a Google search and a search on the DNN forums and can't seem to find anything - I would suspect that a DLL is missing or something, but no clue where to start to look,,,,  thanks in advance for the assistance, if anyone has had the same issue

********************Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately.

Parser Error Message: Could not load type 'DotNetNuke.Services.Sitemap.SitemapHandler' from assembly 'DotNetNuke'.

Source Error:

<pre>
Line 103:      <addverb="*"path="Telerik.Web.UI.WebResource.axd"validate="false"type="Telerik.Web.UI.WebResource, Telerik.Web.UI"/>
Line 104:      <addverb="*"path="ChartImage.axd"type="Telerik.Web.UI.ChartHttpHandler, Telerik.Web.UI, Culture=neutral, PublicKeyToken=121fae78165ba3d4"validate="true"/><fontcolor="#ff0000">Line 105:      <addverb="*"path="Sitemap.aspx"type="DotNetNuke.Services.Sitemap.SitemapHandler, DotNetNuke"/></font>Line 106:      <addverb="*"path="*.htmtemplate"type="DotNetNuke.HtmlEditor.TelerikEditorProvider.HtmTemplateFileHandler, DotNetNuke.HtmlEditor.TelerikEditorProvider"/>
Line 107:    </httpHandlers></pre>

Source File: \\boswinfs05\home\users\web\b252\whl.grandsquare\web.config    Line: 105