All World Gone

Yesterday before the Nether update, I opened up Minecarft and all my worlds were gone but my worlds from the old Minecraft. I tried to create a new world but everytime I did the Minecraft would tell me that the world couldnt load then I would try to go into the world again and the ps4 system would say application error. I also uninstalled and reinstalled Minecraft but that didnt fix the problem.