Eh, they're error system for this is a bit screwed up on occasion. Sometimes if someone from your ISP or someone formerly using your dynamic IP address was screwing around with page ranking or the google site management tools, they'll give this error erroneously to regular users.
It should go away in 30-60 minutes or so.
Be fearful when others are greedy, and greedy when others are fearful. Just another form of "buy low, sell high" for those who have trouble with things. This rule is not universal. Do not buy a 1973 Pinto because everyone else is afraid of it.