CCS/AM3352: AM3352 Timer_create failed,it go to _exit()

Tool/software: Code Composer Studio

Hi

        I want to creat a timer interrupt,and my code is :

Timer_Params timerParams;
Timer_Handle myTimer;
Timer_Params_init(&timerParams);
timerParams.period = 10;
timerParams.periodType = Timer_PeriodType_MICROSECS;
timerParams.startMode = Timer_StartMode_AUTO;
timerParams.arg = 1;
myTimer = Timer_create(Timer_ANY, myIsr, &timerParams, &eb);

after I compile and debug it, it go to _exit after Timer_create. it means creat time filed.

my pdk version is pdk_am335x_1_0_13,and my board is customized.

BR!