When you open Minecraft in Galaxy J7

My phone is: Samsung Galaxy J7.....
My reason about the why is said this, Because it wont let me open Minecraft Pocket Edition when I opened it, It kepts on saying "Unfortunately Minecraft Pocket Edition has stopped" please fix this on the next version of Minecraft Pocket Edition builds 2 or 3... I am also one of your Beta Testers.... Also I'm almost done with the map I've been creating for about 3 months by now