inaspettato messaggio di errore

allora, per Standard:
ho un collegamento sul Desktop che mi lancia la IDE, ho WIN 10 Pro...se faccio uno sketch nuovo mi da 'errore di compilazione'

per Guglielmo: 'la stupidità umana (per esempio la mia) è come l'universo, ha dimensioni astronomiche ed è in continua espansione', ma ci sto lavorando...

#include <Keyboard.h>
int abilitaBlink [] = {0, 0, 0, 0, 0, 0, 0};
int BlinkCounter [] = {0, 0, 0, 0, 0, 0, 0};
int Blink [] = {0, 0, 0, 0, 0, 0, 0};

unsigned long previous = 0;
unsigned long timer = 200;


int Switch[] = {51, 50, 49, 48, 5, 4, 3, 2};
int SwitchState[] = {0, 0, 0, 0, 0, 0, 0, 0};
int Square[] = {47, 45, 43, 41, 9, 17, 19};
int SquareLed[] = {39, 44, 42, 40, 8, 18, 7};
int SquareState[] = {0, 0, 0, 0, 0, 0, 0};
int Last[] = {LOW, LOW, LOW, LOW, LOW, LOW, LOW};

char SwitchPrint[] = {'5', '4', '7', '8', '0', '0', '0', '3'};
char SquarePrint[] = {'N', 'G', '0', 'U', 'L', '0', '0',};

int i = 0;
int Switchstate = 0;
int Squarestate = 0;

int power = 38;
int powerState = 0;
int lastpowerState = 0;

int function = 22;
int functionState = 0;
int lastfunctionState = 0;

int eject = 24;
int ejectState = 0;
int lastejectState = 0;
unsigned long current = millis();

void setup()
{
  pinMode (power, INPUT);
  pinMode (function, INPUT);
  pinMode (eject, INPUT);
  
    for (int i = 0; i < 7; i++)
    {
      pinMode (Square[i], INPUT);

      pinMode (SquareLed [i], OUTPUT);

    }
    for (int i = 0; i < 8; i++)
    {
      pinMode (Switch[i], INPUT);
    }
  }

void BlinkLed(int i)
{

  if (((millis() - previous > timer) && (abilitaBlink[i] == 1 && BlinkCounter[i] < 6)))
  {
    previous = millis();
    SquareState [i] ^= 1;
    if
    (SquareState [i] == HIGH)
    {
      BlinkCounter[i] ++;
    }

    digitalWrite (SquareLed [i], SquareState [i]);
    if (BlinkCounter[i] >= 5)
    {
      abilitaBlink[i] = 0;
      BlinkCounter[i] = 0;
    }
  }
}

void loop()
{
  {

    powerState = digitalRead (power);
    if ((powerState != lastpowerState) && (powerState == HIGH))
    {
      
      lastpowerState = powerState;
    }

    if (powerState == HIGH)
    { for (i = 0; i < 7; i++)
    if (abilitaBlink [i] == 0)
    {
    
        digitalWrite (SquareLed [i], HIGH);
    }
    }
    else
    {
      for (i = 0; i < 7; i++)
        digitalWrite(SquareLed[i], LOW);
    }



    {
      functionState = digitalRead (function);
      if
      (functionState != lastfunctionState )
      {
        Keyboard.begin();
        Keyboard.print ('P');
        Keyboard.end();
        delay (50);

      }
      lastfunctionState = functionState;

      for ( i = 0; i < 8; i++)
      {
        Switchstate = digitalRead (Switch[i]);
        if (Switchstate != SwitchState[i])
        {
          Keyboard.begin();
          Keyboard.print (SwitchPrint [i]);
          Keyboard.end();
          delay  (50);
        }
        SwitchState[i] = Switchstate;
      }
      for ( i = 0; i < 7; i++)
      {
        Squarestate = digitalRead (Square[i]);
        if ((Squarestate != Last[i]) && (Squarestate == HIGH))
        {
          abilitaBlink[i] = 1;
          Keyboard.begin();
          Keyboard.print (SquarePrint [i]);
          Keyboard.end();
          delay  (500);
        }
        BlinkLed(i);
        Last[i] = Squarestate;
      }
     
      {
        ejectState = digitalRead (eject);
        if ((ejectState != lastejectState) && (ejectState == LOW))
        {
          current = millis();
        }

        if ((ejectState != lastejectState) && (ejectState == HIGH) && (millis() - current < 3000 ))
        {
          Keyboard.begin();
          Keyboard.print ('9');
          Keyboard.end();
        }

        lastejectState = ejectState;
      }
      delay (50);
    }
   
  }
}