javascript - Instagram API not working: APINotFoundError

Question

I am using 'instafeed.js' plugin from here to show my client's Instagram photos on their website. I keep getting an error and have no idea what went wrong. This plugin used to work just fine before.

This is my code:

<script type="text/javascript">
    var feed = new Instafeed({
        get: 'user',
        userId: '2030811713',
        clientId: '2d0b703da7c14a378bc19bc04f120da4',
        accessToken: '***',
        target: 'list-inline',
        limit: '10',
        template: '<li><img src="{{image}}"/></li>',
        resolution: 'standard_resolution',
        after: function() {
            var el = document.getElementById('list-inline');
            if (el.classList)
                el.classList.add('show');
            else
                el.className += ' ' + 'show';
        }
    });
    feed.run();
</script>

and this is error I keep getting:

/**/ instafeedCache8030560cf189b254.parse({"meta": {"code": 400, "error_type": "APINotFoundError", "error_message": "this user does not exist"}})

Please help!