warning: yesh omrim RSS feed is wonky

If you're reading my blog through its LJ feed, sethg, you should be warned that LJ is having trouble reading it; the profile page says
Error Message: 500 Can't locate object method "new" via package "HTML::HeadParser"
I don't know what's causing this error, and since I can download the feed's XML file and read it in my browser without any complaints, I think this is a problem on LJ's end, not mine.