Interesting thread. I was seeing the same results on a personal site. It was as if the bot was looking for something "that IT (the bot) was generating" (I sure wasn't) and, not finding "those pages" it was reporting a crawling error.
FWIW, there's no site map.
I haven't taken any steps as I was unable to determine how I was the source of . . the problem.
(Argh. I'm no SEO and this almost seems like G making me an even worse . . SEO. I mean, c'mon. Find my REAL pages, please. ;P)