Black screen then crash on start

I went to open Minecraft PE after installing the 0.15.2 update, I clicked on the app and it loaded the Mojang page then immediately after there was a second of black screen and then it crashed. I have tried restarting my phone several times and deleting the app. After that it worked but when I tried to load my back ups of 2 worlds and 2 resource packs it started to crash again, please fix this.

What I expected to happen was to open the app and play some Minecraft PE

What actually happened was the app opened but crashed soon after.

1. Delete Minecraft PE.
2. Open iTunes and place the back ups of the worlds and texture packs in the Minecraft PE folder.
3. Open Minecraft PE and let it crash