Erro ao compilar o programa

Erro ao compilar este programa:

#include <Keyboard.h>
void setup() {
pinMode(2, INPUT);
pinMode(3, INPUT);
pinMode(4, INPUT);
pinMode(5, INPUT);
pinMode(6, INPUT_PULLUP);
pinMode(7, INPUT_PULLUP);

Keyboard.begin();
}

void loop() {

if(digitalRead(2)==LOW){
//Send an ASCII ‘A’,
Keyboard.write(65);
}

if(digitalRead(3)==LOW){
//Send an ASCII ‘B’,
Keyboard.write(66);
}

if(digitalRead(4)==LOW){
//Send an ASCII ‘C’,
Keyboard.write(67);
}

if(digitalRead(5)==LOW){
//Send an ASCII ‘D’,
Keyboard.write(68);
}

if(digitalRead(6)==LOW){
//Send an ASCII ‘E’,
Keyboard.write(69);
}

if(digitalRead(7)==LOW){
//Send an ASCII ‘F’,
Keyboard.write(70);
}

What does it do? What did you expect?