Ciao a tutti mi dite in cosa sbaglio in questo script:

codice:
const eye_form = document.querySelector("#eye_psw");
eye_form.addEventListener("click", function(e) {
    e.preventDefault();
    let el = this.children;
    if (el.classList.contains("classe")) {
        el.classList.remove("classe");
        el.classList.add("nocalssse")
    } else {
        alert("no");
        el.classList.remove("noclasse");
        el.classList.add("classe");
    }
});
mi da questoe rrore:
TypeError: Cannot read property 'contains' of undefined