the game crashes when trying to load the game with report can't fit lava_flow maybe try a lower resolution resource pack. I have done some research and found there has been a report on this already I have tried deleting the .minecraft folder and reinstalling and have tried logging out and logging back in but that didn't work so I have turned to the dev to see if you could help. my username is stormy_owl if you need to know, I have attached a screenshot of the crash report. I await your reply,

Matthew.