Delete all facebook group members on a given page. Usage: Copy this script, open developers console (F12) in chrome (win) and paste this script. The window will reload when it's finished

Delete all facebook members (all the one visible on a given page)

/**
 * This script will remove all group members displayed.
 *
 * @author: Nir Geier
 *
 * Usage:
 *    Load as many users as you need, then open console and paste this script in the
 *    console.
 *
 *    Once the script finished executing, the page will autoreload.
 *
 *    If looking the console doesn't give any feedback of what's happening, reload the
 *    page and repeat again. Take into account that it will delete one user per second,
 *    so it may take a while.
 */
var FBClearGroup = function() {

    // Get all the Admins settings buttons
    var memberSettings, removeLinks, timer;

    /**
     * This function will click on all the uses admin settings buttons to add the remove link to the page dom
     */
    function exposeRemoveLinks() {
        memberSettings = Array.prototype.slice.call(document.querySelectorAll("button[aria-label='Member Settings']"));

        // Expose all the remove users links except the first one, which is the admin
        console.debug('Getting all remove links...')

        var i = 0;
        var adminsNum = 1;
        memberSettings.forEach(function(item) {
            i = i + 1;
            if (i <= (adminsNum*2) {
                return;
            }
            item.click();
        });

        // continue with the delete flow
        timer = setTimeout(openRemoveDialog, 1000);
    }

    /**
     * This function will display the remove dialog
     */
    function openRemoveDialog() {
        clearTimeout(timer);

        // Grab all the remove links
        removeLinks = Array.prototype.slice.call(document.querySelectorAll("a[ajaxify*='remove.php']"));
        removeLinks.forEach(function(item) {
            item.click();
        });

        // Remove the users
        timer = setTimeout(removeUsers, 1000);
    }

    /**
     * This method will click on the remove user and will remove the user form group
     */
    function removeUsers() {
        // Grab all the confirm buttons
        var confirmButton = Array.prototype.slice.call(document.querySelectorAll('.layerConfirm.uiOverlayButton[type="submit"]'));

        // Verify that the previous step has completed
        if (confirmButton.length + 1 < memberSettings.length) {
            timer = setTimeout(removeUsers, 1000);
        } else {
            // Click on the remove confirm button
            console.debug('Starting removing users')
            var i = 1;
            confirmButton.forEach(function(item) {
                setTimeout(function() {
                    item.click();
                    console.debug('Removed user');
                }, i * 1000);
                i = i + 1;
            });
            
            // Reload the page after everything is finished + 7 seconds
            setTimeout(function() {
                window.location.reload(false); 
            }, (i + 7) * 1000);
        }
    }

    exposeRemoveLinks();
}();

You are code will not work cuz you have defined undefined token which is messing the whole the code, repeating and conjugating the process is going to work, i hope you are going to solve it.
if you need any help pm me anytime