[Haskell-beginners] Generic exception available?

I have one spot in some code where I just want to raise an exception that contains the message "Database is formatted incorrectly." Is there some kind of generic way to throw that (like, e.g., in Ruby you just call 'raise "exception message"'. In this case, I don't particularly want to take the time to think about creating an Exception type or finding a suitable one. (BTW: Is there a hierarchical list of standard Haskell Exception instances somewhere?) -- frigidcode.com theologia.indicium.us