When i first logged in to my xbox account in Minecraft, it works fine, i installed an optifine addon to reduce the lag in the game, So it worked fine as normal. When i logged in to MCPE again the start screen is blank. So i attempted deleting optifine manually and it doesn't seem to work. So i restarted my device, still doesn't fix the problem. So i reinstalled the game, still doesn't work. I tried deleting all files on minecraft and reinstalling it again. it still doesn't work. How do i fix this problem?

(Android Ver is 6.0.1)