[FIXED]When I press the play button, minecraft crashes.

Edit: I've fixed it by reinstalling minecraft. My worlds have been gone, but I can play now.

[iPad mini 3] I updated Minecraft PE to 0.12.1 on my iOS device, from App Store. (from 0.11.1, I think.) I can change the settings, language, but whenever I press the play button Minecraft crashes. (Notice: 0.12.1 release seems like "Unreleased Version" but it released.)