DOJO base/Fx has no animateProperty method

Question

I'm trying to animate the transparency change if a element using dojo/_base/fx animateProperty(). However I hit an error on console saying *Uncaught TypeError: Object # has no method 'animateProperty' *. Not able to figure out what's wrong with the code. Here's the fiddle I created for this.

http://jsfiddle.net/kLMZC/2/

Posting code snippet too:

require(["dojo/fx", "dojox/fx/scroll", "dojo/dom", "dojo/dom-style", "dojo/on", "dojo/domReady!","dojo/window","dojo/dom-geometry","dojo/dom-style", "dojo/_base/fx"],
    function(coreFx, easing, dom, style, on, win, domGeometry, fx){
        on(dom.byId("contactFormButton1"), "click", function(){
            //dojo.byId('screen1').style.opacity = '0.5';
            fx.animateProperty({
                 node: dom.byId("screen1"), duration: 5000,
                 properties: {
                 opacity: { start: '1', end: '0.5' }
                 }
            }).play();


            style.set("screen2", "display", "block");
            dojo.byId('contactFormButton1').style.display = 'none';
            dojox.fx.smoothScroll({
                node: dojo.byId('screen2'),
                win: window
            }).play();
        });
    });

Answer 1

require([
    "dojo/fx", "dojox/fx/scroll",
    "dojo/dom", "dojo/dom-style", "dojo/on", "dojo/domReady!",
    "dojo/window", "dojo/dom-geometry", "dojo/_base/fx"
], function (coreFx, easing, dom, style, on, ready, win, domGeometry, fx) {
    on(dom.byId("contactFormButton1"), "click", function () {
        //dojo.byId('screen1').style.opacity = '0.5';
        fx.animateProperty({
            node: dom.byId("screen1"),
            duration: 5000,
            properties: {
                 opacity: {
                     start: '1',
                     end: '0.5'
                 }
             }
         }).play();

        dojo.byId('contactFormButton1').style.display = 'none';

    });
});

The problem is a mismatch between the require and function parameters. You forgot ready as parameter.

http://jsfiddle.net/kLMZC/2/