Adafruit Feather 32u4 and lowpower

Projects Programming
1

Hi,

I have a adafruit feather 32u4 and i need include the lowpower lib.. GitHub - rocketscream/Low-Power: Low Power Library for Arduino

However my feather crash if i sent simple code like:

#include "LowPower.h"

void setup()
{
  
}

void loop() 
{

  // ATmega32U4
  LowPower.idle(SLEEP_8S, ADC_OFF, TIMER4_OFF, TIMER3_OFF, TIMER1_OFF, 
  		  TIMER0_OFF, SPI_OFF, USART1_OFF, TWI_OFF, USB_OFF);
}

Why ?