My b2evolution Version: Not Entered

Hi I have b2evolution version 2.3.0-rc1 released on 28.12.07 and i have a problem with the rss feed.
when i check on this site :
http://feedvalidator.org/check.cgi?url=http://www.meiniphone.ch/index.php?blog=1&tempskin=_atom

i get this problem
<div class="videoblock"><object data="http://www.youtube.com/v/32nkACIJuiw" ...

how can i solve this.

thanks for helping