Error in making a project

I am making my final project for certificate, on iot based flood monitoring and alerting sensor.
There is arduino program when i try to upload ,it is showing an error. Please help me




I copy paste the coding from here -

@priyakamde199

There are few changes in the code I believe. Below is a verified code of the same, (Changed ‘#’ → ‘//’ to comment on C language)

//IOT Based Flood Monitoring And Alerting System.
#include<LiquidCrystal.h>
LiquidCrystal lcd(2,3,4,5,6,7);
   
const int in=8;
const int out=9;
const int green=10;
const int orange=11;
const int red=12;
const int buzz=13;

void setup(){
Serial.begin(9600);
lcd.begin(16,2);
pinMode(in, INPUT);
pinMode(out, OUTPUT);
pinMode(green, OUTPUT);
pinMode(orange, OUTPUT);
pinMode(red, OUTPUT);
pinMode(buzz, OUTPUT);
digitalWrite(green,LOW);
digitalWrite(orange,LOW);
digitalWrite(red,LOW);
digitalWrite(buzz,LOW);
lcd.setCursor(0,0);
lcd.print("Flood Monitoring");
lcd.setCursor(0,1);
lcd.print("Alerting System");
delay(5000);
lcd.clear();
}

void loop()
{
long dur;
long dist;
long per;
digitalWrite(out,LOW);
delayMicroseconds(2);
digitalWrite(out,HIGH);
delayMicroseconds(10);
digitalWrite(out,LOW);
dur=pulseIn(in,HIGH);
dist=(dur*0.034)/2;
per=map(dist,10.5,2,0,100);
//map function is used to convert the distance into percentage.
if(per<0)
{
  per=0;
}
if(per>100)
{
  per=100;
}
Serial.println(String(per));
lcd.setCursor(0,0);
lcd.print("Water Level:");
lcd.print(String(per));
lcd.print("%  ");
if(per>=80)       //MAX Level of Water--Red Alert!
{
  lcd.setCursor(0,1);
  lcd.print("Red Alert!   ");
  digitalWrite(red,HIGH);
  digitalWrite(green,LOW);
  digitalWrite(orange,LOW);
  digitalWrite(buzz,HIGH);
  delay(2000);
  digitalWrite(buzz,LOW);
  delay(2000);
  digitalWrite(buzz,HIGH);
  delay(2000);
  digitalWrite(buzz,LOW);
  delay(2000);
    
}
else if(per>=55)    //Intermedite Level of Water--Orange Alert!
{
  lcd.setCursor(0,1);
  lcd.print("Orange Alert!  ");
  digitalWrite(orange,HIGH);
  digitalWrite(red,LOW);
  digitalWrite(green,LOW);
  digitalWrite(buzz,HIGH);
  delay(3000);
  digitalWrite(buzz,LOW);
  delay(3000);
  
}else          //MIN/NORMAL level of Water--Green Alert!
{
 lcd.setCursor(0,1);
 lcd.print("Green Alert!  ");
 digitalWrite(green,HIGH); 
 digitalWrite(orange,LOW);
 digitalWrite(red,LOW);
 digitalWrite(buzz,LOW);
}

delay(15000);
}