World can't load instead it exit/saving the world

When i open my worlds IT EXIT/SAVING THE WORLD NOT LOADING IT..!! Does it has something to do with global resources? Or a there a world limit? Or this is just a BIG BUG?
Because before i update my mcpe into 1.2.8.0 everything is just FINE! Then after i update it all the BUGS starting to crashes mcpe!
Pls fix this BUG cause mcpe would be useless if we CAN'T play it at ALL