TWIG Set Checkbox Checked

I have a checkbox for an popup where I have to check it to save a cookie and make the popup not appear every time I change the page.

Here is my PopUp TWIG:

              Liquid error: Unknown operator ajax

Here is my javascript file for the popup module:

    // Popup Module
$('.module-popup').each(function () {
    var $this = $(this);
    var options = $.extend({
        message: $this.html(),
        timeout: 0
    }, $this.data('options'));
    var cookie = 'p-' + options['cookie'];

    if (!Cookies.get(cookie)) {
        setTimeout(function () {
            $('html').addClass('popup-open popup-center');

            $this.find('.popup-dont-show input[type="checkbox"]').on('change', function () {
                if ($(this).is(':checked')) {
                    Cookies.set(cookie, '1', { expires: 1 });
                } else {
                    Cookies.remove(cookie);
                }
            });
        }, parseInt(options['showAfter'], 10) || 1);
    }
});

$(document).delegate('.popup-close, .popup-bg-closable, .btn-popup:not([href])', 'click', function () {
    $html.removeClass('popup-open popup-center');

    if ($html.hasClass('iphone') || $html.hasClass('ipad')) {
        iNoBounce.disable();
    }

    $('.popup-wrapper').attr('removing', true);

    setTimeout(function () {
        if ($('.popup-wrapper').attr('removing')) {
            $('.popup-wrapper').remove();
        }
    }, 5000);
});

$(document).on('keydown', function (e) {
    if (e.keyCode === 27) {
        parent.$('.popup-bg-closable').trigger('click');
    }
});

The idea is that if I change to or , the checkbox becomes checked but I press Enter and if I change the page it appears again. When the popup is appeared, with checkbox checked, if I uncheck and check again and press enter, it works...

What do I do wrong?