[TYPO3] RSS feed does validate

[Bing Du]

Hi,

typo3 4.0.6
tt_news 2.4

Here is the validating result of our typo3 site.
http://www.feedvalidator.org/check.cgi?url=http%3A%2F%2Fwww.biorenew.iastate.edu%2Frss.xml

I know the cause of the error 'link must be a full and valid URL' and how
to fix it.  That's likely caused by missing 'http://' in the manually
entered external URL the news article refers.

But for the rest three highlighted errors, I have no clue.  How does typo3
generate the feed?

Which imiage are the following errors complaining about?

"width must be between 1 and 144"
"height must be between 1 and 400"

For the following error, how should a guid element be added?

"item should contain a guid element"

Thanks much for any help.

Bing