Minecraft crash when i put bow in anvil

i downloaded a mod called "ideas mod" (http://goo.gl/ecdCx), and i enchanted a bow with Speed I, then, i desinstalled this mod, and the bow was just a normal bow, but with the glint effect, and a blue name, when i shift-clicked it in an anvil, my minecraft just crashed...

Sorry, i'm from brazil, and my english is not perfect...