Don't use flashrec. I dont think it works with 2.1.
Install 'ROM Manager' from the market. Open it and the first option will let you flash the clockwork recovery menu. Then, once that's done, the very bottom option in ROM manager will let you flash amon ra (if it's on the root of your sdcard).
Bit annoying you can't flash amon first, since it's better, but it's probably still the easiest way.