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jQuery is not defined

Hi I have a problem I just can not resolve. I have a mobile menu which works fine in the browser but only works on smartphone after refreshing the page

I get

Uncaught ReferenceError: jQuery is not defined

Here is the code, and below that is the order in which the scripts load

(function($) {

$.fn.collapsable = function(options) {

return this.each(function() {

  var obj = $(this);
  var tree = obj.next('.main-menu ul');
    if( obj.is(':visible') ){ tree.toggle();}
    if ( $(window).width() <= 800 ){tree.attr('style','');}; 


(analytics code loads first top of the page www.google-analytics.com/analytics.js)

rest of the script loads from the footer all inside the body mobile-menu.js relates to the code above.

<script async src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js" type="text/javascript"></script>
<script async src="js/mobile-menu.js" type="text/javascript"></script>

<script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
<script async>(adsbygoogle = window.adsbygoogle || []).push({});</script>
<script async>(adsbygoogle = window.adsbygoogle || []).push({});</script>
<script async>(adsbygoogle = window.adsbygoogle || []).push({});</script>

Its driving me insane as it all works great except for the load on the mobile.

Many Thanks for taking a look.

2 Answers

The answer was to remove async.

Sorry for the awful formatting.