CC2640 Perpherial工程调用Power_shutdown(NULL)返回出错，代码如下，求指导

SimpleBLEPeripheral_taskFxn()中调用的Power_shutdown()

if (events & SBP_PERIODIC_EVT)
  {
   events &= ~SBP_PERIODIC_EVT;
            
   // Perform periodic application task
   // SimpleBLEPeripheral_performPeriodicTask();
            
            Util_stopClock(&periodicClock);
            
            Power_shutdown(NULL);
 }