Error displayed in RSS after uploading

Hello,

Any body can suggest me what actually following error is:

Following error has bees displayed after uploading RSS xml file:
Cannot view XML input using XSL style sheet. Please correct the error and then click the Refresh button, or try again later.

Whitespace is not allowed at this location.

Following code has been used:
<?xml version="1.0" encoding="UTF-8" ?>
<rss version="2.0">
<channel>
<title></title>
<link></link>
<description></description>
<webMaster></webMaster>
<lastBuildDate>Thu, 5 Oct 2006 11:27:05 GMT</lastBuildDate>
<item>
</channel>
</rss>

Please give me an advice to rectify error..

Waiting for reply