jquery - javascript error "is not a function..." but libraries are loaded -

i'm trying use fancytree in durandal page. i've done before can't seem working , it's driving me mad.

i have js debug stop point on $("#tree").fancytree... line , @ point code stops, have following 3 libraries loaded:

jquery-1.12.1.js     jquery-ui-1.11.4.js  jquery.fancytree.js  

and yet there no "fancytree" prototype method showing element , system.js:109 typeerror: $(...).fancytree not function(…) on initialization line. in past has been caused lacking jquery-ui library, loaded here.

what missing please?

edited add more information.

html largely irrelevant has

<div id="tree"></div> 

there attached viewmodel contains:

    self.attached = function (vw, prt) {         buildtree(vw);     } 

and

    function buildtree(view) {         // initialize fancytree         $("#tree").fancytree({             checkbox: true,             selectmode: 2,             source: {url: "testdata/ajax-tree-taxonomy.json", debugdelay: 1000},             toggleeffect: { effect: "drop", options: {direction: "left"}, duration: 400 },             lazyload: function(event, data) {                 data.result = {url: "testdata/ajax-sub2.json", debugdelay: 1000};             }         });      } 

i put debug stop point @ $("#tree").fancytree({ line , has loaded libraries mentioned above.

edit 2: curiouser , curiouser... i've been doing more debugging. put stop point inside of jquery.fancytree.js library , code execution gets in there! what's more, creates element.fancytree method needed , stays attached element long while during debugging. trouble is, happens later in jquery initialization removes .fancytree() method element , before code execution gets out of jquery library!

i have test html page loads exact same jquery, jquery-ui , jquery.fancytree libraries , works fine. must surely durandal then?

fixed it! requirejs reloading jquery. found answer on question: make requirejs not reload jquery if on page

i added:

define('jquery', [], function () {     return jquery; }); 

...after require.js.config({...}); section , before define(['knockout', 'durandal/system', ... { section.

can't believe simple...