Пофиксить ошибку

Помогите исправить ошибку показанную на скрине.

 const focusOnMe = document.getElementsByClassName('focusOnMe')[0];
const mypopup = document.getElementById('mypopup');

console.log(focusOnMe);
focusOnMe.addEventListener("mouseovser", showPopup);

console.log(focusOnMe);
focusOnMe.addEventListener("mouseout", hidePopup);


function showPopup(evt){
    const focusPos = focusOnMe.getHumRect();
    mypopup.style.left = (focusPos.right + 20) + "px";
    mypopup.style.top = (window.scrollY + focusPos.top - 60) + "px";
    mypopup.style.display = "block";
}

function hidePopup(evt) {
    mypopup.style.display = "none";
}