Natsuko, is your PC strong enough for CAW? Do you have enough free space? Have you only patched latest version or install it from scratch? CAW is much more demanding than Sims 3, and saving world in Edit in game is very long proces, specialy once you start placing lots in it. Also, make shore you don't have any CC and mods. I had it crash maybe 2 times in Edit in Game, but only after I spent a long time in it, on highest settings, so save often. Once I cleared space for virtual energy it needs, I haven't expirienced it in a while.
Hope you'll manage to play with it soon.