jQuery not working when adding ease property

I'm currently working on jQuery for animations in my website but the easing property is not working!

Here's the code:

$(window).load(function()
{
    $('div').animate({'height': '10px'}, 2000, 'easeInOutQuad');
}
);

Unfortunaltly, for some reason, it seems that jQuery doesn't recognize the ease property of .animate(), showing me a lot of errors, but ONLY WHEN I PUT EASE property! Do I need to install something special? I only refers to jquery 1.11.2

Please help!