Game crashed, now I can not make a copy of my world

I was flying around with rockets in one hand and a map in the other and suddenly the game crashed. A screen came up saying, "Your world has been corrupted, please report to bugs.mojang.com." Then it all closed out. When I reopened the game it seemed to load fine. So I quit to save and make a copy but the copy fails every time. It just says "Failed to make a copy of your world."