Maybe a week or 2 ago Back when Minecraft released a small bug fix update that fixed horses and a duplication glitch. a world me and my friend played stoped working after the update came out. I thought it probably wasn't the update but the day before update the world worked fine but the day of the update the world gets stuck on "we are unable to load this world" and when pressing ok the game freezes and we tried copying it using a external storage but nothing works we are going to wait until a new update comes out to try again but if that doesn't work we will delete Minecraft and download again and if that doesn't work we won't know what to do