Mqtt_simple sample error.

Trying to up load mqtt_simple sample, however getting bus fault on terminal. have browsed after the same issue here, but don't work after doing git pull ect...

here's the output:

***** BUS FAULT *****

Precise data bus error

BFAR Address: 0x4002a514

***** Hardware exception 

Current thread ID = 0x2000033c

Faulting instruction address = 0x70b8

fault in essential thread! Spinning...