Jason,
First thing I would do is to go into the Global Config section of your site and check to make sure that Debug Site is turned off. I was getting problems one day with various errors on several modules and I found that I had changed the settin to on instead. Once I turned it off, it worked fine.
Don't ask me why you got the errors anyways, as long as the debug is off and it works, I don't care. Still a Joomla and ArtioSEF newbie myself.
If that does not work, I would uninstall the compenent (check in your files to be sure you delete everything and then reinstall it.
Hope that helps, good luck.
Chris