I close the app when i was sleeping and now the game doesn't work

 

Good night.

My problem was in Minecraft, in an advanced world, when I left the application to answer a message, I left the application almost when I had just started sleeping, I wanted to open the game again and what it tells me in the image comes out and it leaves the game, I would appreciate it if you could help me, since the world I have is already very advanced and I would like it back.