JS Event Does not Trigger From File

Hi Experts,

If you go to http://aces-project.com/2017/_NEW.php and click on the hamburger menu right of the email, you will see that nothing happens. Whereas you wll see that in js/header.js, line 78 I have a trigger.

Even more stranger when I copy the following into chrome console and click on the hamburger, it does triiger the alert.

$('#divMobileBars').on('click', function(){
    alert('xyz');
});

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Any help will be appreciated.