MLX90614 infrared sensor error using Adafruit library

08.05mlxtest_v2.ino

/***************************************************
  This is a library example for the MLX90614 Temp Sensor

  Designed specifically to work with the MLX90614 sensors in the
  adafruit shop
  ----> https://www.adafruit.com/products/1747 3V version
  ----> https://www.adafruit.com/products/1748 5V version

  These sensors use I2C to communicate, 2 pins are required to
  interface
  Adafruit invests time and resources providing this open source code,
  please support Adafruit and open-source hardware by purchasing
  products from Adafruit!

  Written by Limor Fried/Ladyada for Adafruit Industries.
  BSD license, all text above must be included in any redistribution
 ****************************************************/

#include <Adafruit_MLX90614.h>

Adafruit_MLX90614 mlx = Adafruit_MLX90614();
float myEmissivity = 0.99;

void mlx_set(float emissivity) {
  mlx.writeEmissivity(emissivity);
  Serial.println("setting emissivity");
}

void setup() {
  Serial.begin(115200);
  Serial.println("Adafruit MLX90614 test");
  if (!mlx.begin()) {
    Serial.println("Error connecting to MLX sensor. Check wiring.");
    while (1);
  };
}

void loop() {
  while (myEmissivity >= 0.80){
  Serial.print("Ambient = "); Serial.print(mlx.readAmbientTempC());
  Serial.print("*C\tObject = "); Serial.print(mlx.readObjectTempC()); Serial.println("*C");
  Serial.println();
  mlx_set(myEmissivity);
  myEmissivity = (myEmissivity - 0.01);
  Serial.print("New emissivity = "); Serial.println(myEmissivity);
  delay(500);
}
}