[Error with Code. Please HELP] Water Level Sensor using HC-SR04

Projects Programming
1

I 'm trying to make a water level sensor with LEDs and Arduino uno to indicate the level of water in a tank. I tried writing this code but im getting a error. I want the all three leds to light up when the tank is filled (less distance).
I followed this tutorial but the code it had was showing 0 for the sensor value constantly.

Here is my code

#include <Ultrasonic.h>

#define TRIGGER_PIN  6
#define ECHO_PIN     7

Ultrasonic ultrasonic(TRIGGER_PIN, ECHO_PIN);

void setup()
  {
  Serial.begin(9600);
  pinMode(13,OUTPUT);
  pinMode(12,OUTPUT);
  pinMode(11,OUTPUT);
  
  }

void loop()
  {
  float cmMsec, inMsec;
  long microsec = ultrasonic.timing();

  cmMsec = ultrasonic.convert(microsec, Ultrasonic::CM);
  inMsec = ultrasonic.convert(microsec, Ultrasonic::IN);
  Serial.print("MS: ");
  Serial.print(microsec);
  Serial.print(", CM: ");
  Serial.print(cmMsec);
  Serial.print(", IN: ");
  Serial.println(inMsec);
  delay(1000);
  }

void led () {

 digitalWrite(13,LOW);
 digitalWrite(12,LOW);
 digitalWrite(11,LOW);

 if (cmMsec > 20) {
  digitalWrite(13,HIGH);
 }

 if (cmMsec >=20 and cmMsec >= 10) {
  digitalWrite(12,HIGH);
 }
 
 if (cmMsec < 10) {
  digitalWrite(11,HIGH);
 }
}

 
}
2

Your code appears to have too many }