Uncaught TypeError: $(...).bootstrapToggle is not a function

[nurullahguc]

How can i fix it?

Here is my code;

`

                    <input id="chkToggle" type="checkbox" data-toggle="toggle">

                    <script>
                        $(document).ready(function () {
                           setTimeout(function () {
                               $('body #chkToggle').bootstrapToggle('on', true);
                                alert('asd');
                           }, 2000);

                        })
                    </script>

`