Since the alpha 0.9.0, I can not create worlds because I get the message "my world can not be opened" appears and if I believe in previous versions worlds worlds remain charged. This bug has ranged from several versions: 0.9.0: my wordl is corrupts and can not be starte 0.10.0: 0.11.0 corrupts my wordl is error bad file number 0.12.1: my wordl can not be opened 0.13 .0: my wordl can not be opened

PS: my device is a Samsung Galaxi Tab of android 4.4.2