Error trying to change src of image using javascript

function changeImage(index) {
  console.log(`${index+1}`);

  var image1 = document.getElementById("img1");
  image1.src = `images/${index+1}/1.png`;
}

function changeImage(index) {
  console.log(`${index+1}`);

  var image1 = document.getElementById("img1");
  image1.src = `images/${index+1}/1.png`;
}