Wierld, I've always typed in single words in the past to search for things and I never came across this error before. I tested words such as "hello", "test", "Welcome", "does it" and they don't seem to be working properly :S.
I also noticed that when you type something with 2 characters or less, it would pop up with a message saying "your search is too short". I'm sure that if there is a check like that, then an error message like this shouldn't pop up in normal cases.
Tried doing the search again just now. It seems like it sometimes work and then sometimes it doesn't. I typed "developers" about 2 minutes ago, then tried again the exact same word 30 seconds ago and then something normal popped up instead (Except there wasn't any results displayed). :S:S:S:S:S