jQuery.easing[jQuery.easing.def] is not a function

Question

I am getting below error when I look in the console:

jQuery.easing[jQuery.easing.def] is not a function

I am trying to make a slider on Wor

Answer 1

Please check that whether you are loading jQuery more than once. If you have inserted in the footer manually, try removing it.

Answer 2

if(typeof jQuery.easing[jQuery.easing.def] == 'function'){
    return jQuery.easing[jQuery.easing.def](x, t, b, c, d);
}

try this code on swing() function on easing.js

Answer 3

It may happen if you are calling the WordPress slider plugin's javascript before jQuery or jQuery UI call.

Does it resolve this way?

<script type="text/javascript"
        src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
    <script type="text/javascript"
        src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.4/umd/popper.min.js"></script>
    <script type="text/javascript"
        src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.1.3/js/bootstrap.min.js"></script>
        <script type="text/javascript" src="/wordpress-slider-plugin.js"></script>