My code doesn't work. Can't find my error despite using developer tools :S

what have I done wrong? It keeps on telling me there's a syntax error on line 51 and I've tried numerous times to fix it..

const toggleList = document.getElementById('toggleList'); const listDiv = document.querySelector('.list'); const descriptionInput = document.querySelector('input'); const descriptionP = document.querySelector('p.description') const descriptionButton = document.querySelector('button') const listUl = listDiv.querySelector('ul'); const addItemInput = document.querySelector('input.addItemInput') const addItemButton = document.querySelector('button.addItemButton') const lis = listUl.children;

function attachListItemButtons(li) { let up = document.createElement('button'); up.className = 'up'; up.textContent = 'Up'; li.appendChild(up);

let down = document.createElement('button'); down.className = 'down'; down.textContent = 'Down'; li.appendChild(down);

let remove = document.createElement('button'); remove.className = 'remove'; remove.textContent = 'Remove'; li.appendChild(remove); }

listUl.addEventListener('click', (event) => { if (event.target.tagName == 'BUTTON') { if (event.target.className == 'remove') { let li = event.target.parentNode; let ul = li.parentNode; ul.removeChild(li); } if (event.target.className == 'up') { let li = event.target.parentNode; let prevLi = li.previousElementSibling; let ul = li.parentNode; if (prevLi) { ul.insertBefore(li, prevLi); } } if (event.target.className == 'down') { let li = event.target.parentNode; let nextLi = li.nextElementSibling; let ul = li.parentNode; if (nextLi) { ul.insertBefore(nextLi, li); } } });

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'; } });

descriptionButton.addEventListener('click', () => { descriptionP.innerHTML = descriptionInput.value + ':'; descriptionInput.value = ''; });

addItemButton.addEventListener('click', () => { let ul = document.getElementsByTagName('ul')[0];
let li = document.createElement('li'); li.textContent = addItemInput.value; attachListItemButtons(li); ul.appendChild(li); addItemInput.value = ''; });