HX711 and load cell not working with Arduino Uno

I am trying to read values from a HX711 sensor with a load cell connected; however, I am unable to do so.

This is the code I'm using from the HX711 github repo:

#include "HX711.h"

// HX711 circuit wiring
const int LOADCELL_DOUT_PIN = 3;
const int LOADCELL_SCK_PIN = 2;

HX711 scale;

void setup() {
  Serial.begin(9600);
  scale.begin(LOADCELL_DOUT_PIN, LOADCELL_SCK_PIN);
}

void loop() {

  if (scale.is_ready()) {
    long reading = scale.read();
    Serial.print("HX711 reading: ");
    Serial.println(reading);
  } else {
    Serial.println("HX711 not found.");
  }

  delay(1000);
  
}

This is my serial monitor output:
HX711 reading: 0
HX711 reading: 0
HX711 reading: 0
HX711 reading: -1
HX711 not found.
HX711 not found.
HX711 not found.
HX711 reading: 0
HX711 reading: 0
HX711 reading: 2047
HX711 not found.
HX711 not found.
HX711 not found.
HX711 not found.
HX711 not found.
HX711 not found.
HX711 reading: -512

Can someone please tell me what it means by HX711 not found?

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