It Wont Let Me Into My Worlds

For some reason every time now whenever I sign into my Xbox account and try to go into a world it wont let me. I dont know whats wrong. If its a problem with my account or something. Or its a glitch. If it is a glitch please fix it. I tried many times on several different worlds. But it still wont let me in. If you do fix it I would appreciate it. Thanks!

Kittycatmincraft about Minecraft: Pocket Edition, v1.1.4