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JavaScript JavaScript and the DOM (Retiring) Responding to User Interaction Listening for Events with addEventListener()

Why doesn't this work for me? toggleList.addEventListener('click', () => { I keep getting errors, code does nothing

I should have posted this about 4 videos back but this code does not work, I keep getting an error message in the console and nothing has worked, so I've just been following along with the videos unable to do anything. I keep getting an error for the first line.Please help.

toggleList.addEventListener('click', () => {
  if (listDiv.style.display == 'none') {
    toggleList.textContent = 'Hide list';
    listDiv.style.display = 'block';
  } else {
    toggleList.textContent = 'Show list';
    listDiv.style.display = 'none';
  }
});

what is the specific error being returned?

did you define toggleList?