Help with "exit status 1 toneAC.h: No such file or directory"

Greetings everyone,
I am working on a project using Arduino Uno and Max8.

here is the script/code:

/**

#include <NewPing.h>
#include <toneAC.h>

#define DEBUG false // Set to true to enable Serial debug
#define TONE_PIN 8
#define TONE_VOLUME 10 // 1-20
#define TRIGGER_PIN 12 // Board pin tied to trigger pin on the ultrasonic sensor.
#define ECHO_PIN 11 // Board pin tied to echo pin on the ultrasonic sensor.
#define MAX_DISTANCE 200 // Maximum distance we want to ping for (in centimeters). Maximum sensor distance is rated at 400-500cm.

NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE);

void setup() {
if (DEBUG) {
Serial.begin(115200);
Serial.println(“Theremino starting”);
}
}

void loop() {
delay(30); // Wait 30ms between pings (about 33 pings/sec). 29ms should be the shortest delay between pings.
unsigned long uS = sonar.ping(); // Send ping, get ping time in microseconds (uS).

if (DEBUG) Serial.println(uS);

if (uS > 2000) { // Range is about 0-30 cm from sensor
toneAC(0); // Turn sound off when not in range
if (DEBUG) Serial.println(“No tone”);
} else {
int freq = 2000 - uS / 1.5; // Get sound frequency
toneAC(freq, TONE_VOLUME); // Play it!
if (DEBUG) Serial.println(freq);
}
}

here is the error message:

error: toneAC.h: No such file or directory
compilation terminated.
Using library NewPing at version 1.9.1 in folder: /Users/ekym1536/Documents/Arduino/libraries/NewPing
exit status 1
toneAC.h: No such file or directory

I haven’t worked with code before, PLEASE HELP?! THANKS

You need to install the toneAC library. A quick search brings you e.g. here with instructions for download/install