cc3200 SDHost Memory or Stack Fault

Hi Friends??

i used cc3200 launchxla and i faced some fault.

that fault is as follow....

ti.sysbios.family.arm.m3.Hwi: line 1095: E_hardFault: FORCED
ti.sysbios.family.arm.m3.Hwi: line 1172: E_busFault: IMPRECISERR: Delayed Bus Fault, exact addr unknown, address: e000ed38
Exception occurred in background thread at PC = 0x20011ea6.
Core 0: Exception occurred in ThreadType_Task.
Task name: {unknown-instance-name}, handle: 0x20020a30.
Task stack base: 0x4093b262.
Task stack size: 0x1249522a.
R0 = 0x2d8d9154 R8 = 0x6eb36165
R1 = 0x52af7d5c R9 = 0x000000fa
R2 = 0x00000020 R10 = 0x00000000
R3 = 0x00000001 R11 = 0x00000020
R4 = 0x20020a30 R12 = 0x15780200
R5 = 0x200298b8 SP(R13) = 0x20021198
R6 = 0x00000003 LR(R14) = 0x2000d081
R7 = 0xe730c11d PC(R15) = 0x20011ea6
PSR = 0x61000000
ICSR = 0x0400f803
MMFSR = 0x00
BFSR = 0x04
UFSR = 0x0000
HFSR = 0x40000000
DFSR = 0x0000000b
MMAR = 0xe000ed34
BFAR = 0xe000ed38
AFSR = 0x00000000
Terminating execution...

and i used SDHost example source code.

and i used ti-rtos.

this is ti-rtos config file (app.cfg)

/*
 * The BIOS module will create the default heap for the system.
 * Specify the size of this default heap.
 */
Program.heap = 0x8000;


/* 
 * System stack size (used by ISRs and Swis) 
 */
Program.stack = 0x2000;

i think that is memory or stack size fault.

why this happened?

please do not say "read reference file"
i know that and i was read that file...
but i still do not know...

plz help me TI friend..