I am trying to run a simple code for web crawler written in this page .
every thing is fine and I tried the program on several sites and it works fine but there is one site instead of returning the html content in its pages it generates a srtange error :
DotNetNuke Error: - Version 04.05.01 Return to main page
and the html returned is :
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html lang="en-US">
<head>
<title id="Title">Error</title>
<link id="StyleSheet" href="/Install/Install.css" type="text/css" rel="stylesheet"></link>
</head>
<body>
<form name="Form" method="post" action="ErrorPage.aspx?tabid=186&error=Object+reference+not+set+to+an+instance+of+an+object.&content=0&language=ar-SY" id="Form">
<input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="/wEPDwUJNTkzNjY2ODU2D2QWBAIDDxYCHgRocmVmBRQvSW5zdGFsbC9JbnN0YWxsLmNzc2QCBQ9kFgICAg8PFgIeBFRleHQFRDxpbWcgc3JjPSIvaW1hZ2VzL2x0LmdpZiIgYm9yZGVyPSIwIiAvPiDYsdis2YjYuSDYp9mE2Ykg2KfZhNmF2YjZgti5ZGRk2aDp+vZbUIDHSd3beGBaLQrJ6yk=" />
<table cellspacing="5" cellpadding="5" border="0" class="Error">
<tr>
<td><img id="Image1" src="logo.gif" alt="DotNetNuke" border="0" /></td>
</tr>
<tr style="height:100%;">
<td valign="top" style="width:650px;">
<h2>DotNetNuke Error: - Version 04.05.01</h2>
<hr />
<p>
<table border="0" cellspacing="0" cellpadding="4">
<tr>
<td valign="top" align="left"><img id="ctl00_imgIcon" src="images/red-error.gif" border="0" /></td>
<td valign="middle" align="left"><span id="ctl00_lblHeading" class="NormalRed">an error has been occurred<br/></span><span id="ctl00_lblMessage" class="Normal">return to the site.</span></td>
</tr>
</table>
<hr noshade size="1"/></p>
</td>
</tr>
<tr>
<td align="right"><a id="hypReturn" class="WizardButton" href="Default.aspx"><img src="/images/lt.gif" border="0" /> return to the site</a></td>
</tr>
<tr><td height="10px"></td></tr>
</table>
</form>
</body>
</html>
so what is DotNetNuke Error and what is the problem...BTW the error occurred in an Arabian site and I tried on another Arabian sites and there were no errors.