Foundation 6 - Console Warning : Tried to initialize magellan (any JS plugin) on an element that already has a Foundation plugin

UPDATE

For Version 6.4.*, all plugins and js based elements tend to work only if $(document).foundation(); is mentioned within the html file. So delete it from app.js if you have written in it. For additional reasons, go through the explanation below.

---

Although I have mentioned the answer long back in the comments of the question, I felt it will be better to write it up with few more points.

While installing Zurb Foundation 6 using bower (command line), it gives you a nice index.html page to get started which has the <script> tag that refers to an external js file located at root\js\app.js. The app.js file by default has the following code:

$(document).foundation(); //invoke all jQuery based Foundation elements

So basically, you already have everything to get started.

But, this wasn't the way how it worked until Foundation 6 and I wasn't aware of these changes. I didn't go through the contents of app.js as I was assuming it to be empty. I simply did the old way of invoking them in my html pages by writing the following code:

<script type="text/javascript">
  $(document).foundation();
</script>

This kind of double referred the jQuery based Foundation elements raising a warning at the browser console.

Solution was to remove either of the invocation, but actually removing the code written in external js file makes more sense for the following reasons:

1. External references cost an additional http request, very slightly increasing the precious page load time. Why not reduce it, if you can.
2. Invoking jQuery based elements in the site has to be done as early as possible so that every element gets the original shape in no time. So it makes more sense to mention the invocation within a html page rather than request a external file to invoke. So, remove the code mentioned in the external js file, that is your app.js file. The warnings would vanish.
3. For Version 6.4.*, all plugins and js based elements tend to work only if mentioned within the html file.