What is wrong with my RSS file?

["webrank" <kalena@webrank.com.au>]

Hi everyone, I am new to RSS and a friend kindly helped me set one up 
for my search engine news blog. The file is here: 
http://www.high-search-engine-ranking.com/senb.rss

But when I tried to register it on the Userland site, I received the 
following error:

"There was a problem reading or parsing your XML file. Here's the 
error message. Poorly formed XML text, it must end with a </tag>. (At 
character #2673.)"

Can anyone tell me how to fix this? I am not a programmer.

thanks in advance,
Kal