Originally Posted by mineistaken

Why did I get that error for the first time only today while I did not have robots.txt all the time (about 2-3 months with that site added to webmaster tools account)

Why does that message say that google did not crawl the site today after 4 attempts while they crawled it ok for the past 2 months? Why absence of robots.txt stopped them only today and not every day before to day?