The feed.... seems to be broken!!!! error message

hi everybody,
i was attending to make news managent system:
so i downloaded the module "news_page-6.x-1.0-rc1.tar.gz" and here is the steps that i made:--
1)Administrator->feed aggregator->add category->add fill the title "aggregator1" and Discreption"aggregator test1"

2)Add feed->title(yahoo),URL(http://www.yahoo.com),Categorize news items: check to the"aggregator1"

3) go to create content->News Page->create a new page and file the textboxes as the following:
title:page 1
Menu link title:news test
Body:hello news page
input formate: Full HTML (as in the read me for the module)
Aggregator Category: select the aggregator 1
Include Words: ipod, -shuffle (as an example)

4) save

5)Administraor->feed aggregator->update items (yahoo).....i found this error

"The feed from yahoo seems to be broken, because of error "XML_ERR_NAME_REQUIRED" on line 1.
The feed from yahoo seems to be broken, because of error "302 feed not parseable"."

and when i log out to test the news page it doesnot appeare as alink which supposed to direct me to yahoo.

i donot know why and how i can fix that

thanks for advance