Wow. When I'm working on something serious I make like five backups a day, at least. Usually it's more.
Looks like you learned this lesson the hard way. Back up your .caps regularly! Or turn on Autosave! Losing work is no fun.
Anyway, I was able to get your .cap to run by deleting that object, and a few others, but I can't recall which ones exactly. You're going to have to tinker around with it a bit to get it back into workable shape. You're probably going to lose some work, but at least it's not a whole month's worth.