Crash on write

Hi. I'm using the IOCipherExample (with gradle configuration) and, when i'm trying to write (copying the alberti_cipher_disk.png file), i have this crash

Fatal signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x242 in tid 22029 (Thread-6), pid 22002 (iocipherexample)