Gravatar not working properly

Application error
Change this error message for exceptions thrown outside of an action (like in Dispatcher setups or broken Ruby code) in public/500.html

This happens every time I try setting a gravartar on their website. It seems to me that either their service is down, or just not functional. I’m dubious now about wanting to include this on my blog since all I get is the gravatar default image and as far as I can see there’s no way for users to upload photos without running into an error on the site.