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CC2652R: osalportTimer is not calling event in zigbee stack

Part Number: CC2652R
  /* Configure app task. */
    Task_Params taskParams;

    Task_Params_init(&taskParams);
    taskParams.stack = kz_main_appTaskStack;
    taskParams.stackSize = _KZ_APP_TASK_STACK_SIZE;
    taskParams.priority = 1;

    extern void KZ_AppMain_init(UArg a0, UArg a1);
    Task_construct(&kz_main_appTask, KZ_AppMain_init, &taskParams, NULL);
    KZ_Main_set_event(_KZ_MAINEVT_BACKUP_PAIR,15000,false);
where the kz_main_set_event is 
void KZ_Main_set_event(uint32 event, uint32 delay, bool periodic)
{
    //queue event with delay if delay not 0
    if (delay)
    {
        if (periodic)
            OsalPortTimers_startReloadTimer(kz_main_taskId, event, delay);
        else
            OsalPortTimers_startTimer(kz_main_taskId, event, delay);
    }
    //update app events and set task app event
    else
    {
        OsalPort_setEvent(kz_main_taskId, event);
    }
}
after 15 seconds i'm not able to get a event callback.. using sdk 6.10