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#define Btn_plus_minute   9
#define Btn_minus_minute  10
#define Btn_Start_minute  8
#define Provod_Stop       A3
#define ledPin 13

int timerFlag=0;
int duration=30;
int uskorenie=500;  
boolean polovinaFlag=0;

#include "TM1637Display.h"                                    
#define DISPLAY_CLK_PIN 11                             
#define DISPLAY_DIO_PIN 12
TM1637Display display(DISPLAY_CLK_PIN, DISPLAY_DIO_PIN);
unsigned char hour=0;
unsigned char minute=30;                              
unsigned char second=0;                               
unsigned char halfsecond=0;

unsigned long timeTimer=0;          
unsigned long startTimer=0;        

void setup() {
   display.set(7);  
   display.init();  
   //Serial.begin(9600);
   
  pinMode(Btn_plus_minute,   INPUT_PULLUP);
  pinMode(Btn_minus_minute,  INPUT_PULLUP);
  pinMode(Btn_Start_minute,  INPUT_PULLUP);
  pinMode(ledPin, OUTPUT);
}
void loop() {
  opros_knopok();
  timer();
  displey();
  }
void opros_knopok() {
   if (digitalRead(Btn_plus_minute)==LOW) {delay (250), duration++;}      
   if (digitalRead(Btn_minus_minute)==LOW){delay (250), duration--;       
     if(duration==0){duration=60;}}
   if (digitalRead(Btn_Start_minute)==LOW){delay (250); timerFlag=1;     
       uskorenie=500; polovinaFlag=0; startTimer=millis();}
       
   if (analogRead(Provod_Stop)>20)  {delay (150),timerFlag=0;}            
      
}   
    
void timer() {
  if (timerFlag==1){timeTimer = (millis()- startTimer);  
     if (timeTimer>=uskorenie){
     halfsecond ++;
     startTimer=millis();
 }
      if(halfsecond == 2){halfsecond = 0, second-- ;}
        if(second == 0){second = 59, duration--;
  }
   }      
 if (timerFlag==1 && duration==-1){ 
   second = 0;
   startTimer=0;
   duration=0;                      
   timeTimer=0;
   timerFlag=0;                     
   digitalWrite(ledPin, HIGH);
   polovinaFlag=0;
  }}
    
void displey() {
   hour=duration/60;
   minute=duration-(hour*60);
   
 if (duration>=60){            
   int8_t timeDisp[4];         
   timeDisp[0] = hour / 10;    
   timeDisp[1] = hour % 10;    
   timeDisp[2] = minute / 10;  
   timeDisp[3] = minute % 10;  
   
   display.display(timeDisp);  
   display.point(halfsecond ==1 ? POINT_OFF : POINT_ON); 
  }
 if (duration<60){
   int8_t timeDisp[4];          
   timeDisp[0] = minute / 10;   
   timeDisp[1] = minute % 10;   
   timeDisp[2] = second / 10;   
   timeDisp[3] = second % 10;   
  
   display.display(timeDisp);   
   display.point(halfsecond ==1 ? POINT_OFF : POINT_ON); 
}}

На этих строчках вылезает ошибка:

void setup() {

В чем проблема?
Скетч не мой. Плата ардуино нано.