RTOS/LAUNCHXL-CC1310: the program hangs up on RF_close function in NORTOS

Tool/software: TI-RTOS

Hi. I'm using CC1310 with NORTOS to test RF tx. The  program hangs up on RF_close function.

The testing code is:

void *mainThread(void *arg0)
{
    RF_Params rfParams;
    RF_Params_init(&rfParams);

    /* Open LED pins */
    ledPinHandle = PIN_open(&ledPinState, pinTable);
    if (ledPinHandle == NULL)
    {
        while(1);
    }

    RF_cmdPropTx.pktLen = PAYLOAD_LENGTH;
    RF_cmdPropTx.pPkt = packet;
    RF_cmdPropTx.startTrigger.triggerType = TRIG_ABSTIME;
    RF_cmdPropTx.startTrigger.pastTrig = 1;
    RF_cmdPropTx.startTime = 0;
    RF_Handle rfHandle = RF_open(&rfObject, &RF_prop, (RF_RadioSetup*)&RF_cmdPropRadioDivSetup, &rfParams);
    RF_close(rfHandle);

    while(1)
    {

    }
}

...

Best Regards.