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


Fatal 
fault in essential thread! Spinning...