Minecraft PE Beta 0.16 won't load up

Hi! I'm a beta tester, and really excited to play Minecraft 0.16, but whenever I try to load it up, the screen goes black for about 5 seconds, then just returns to the home screen. Please tell me how to fix this, I don't want to have to lose all of my worlds which I've been working on for the past three years... so deleting it isn't an option.

Also, sorry if I did anything wrong, this is my first report.