JQuery error: Uncaught TypeError: f[b] is not a function

JQuery error: Uncaught TypeError: f[b] is not a function, someone asked me to explain?

I created a bootstrap model popup when I tried to open it via jQuery, I got this following error “Uncaught TypeError: f[b] is not a function” and a bootstrap model popup is not opening. 

Uncaught TypeError: f[b] is not a function


<script type="text/javascript">
        $(function () {
            $("#btnShow").click(function () {
<div style="text-align: center; margin-top: 10%">
        <button id="btnShow" class="btn btn-primary btn-lg">Show Modal Popup</button>
    <!--Modal -->
    <div class="modal fade" id="demoModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
        <div class="modal-dialog">
            <div class="modal-content">
                <div class="modal-header">
                    <button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
                    <h4 class="modal-title" id="myModalLabel">Bootstrap Modal Popup</h4>
                <div class="modal-body">content goes here..</div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
                    <button type="button" class="btnbtn-primary">Save changes</button>



Previously, I used the wrong syntax to open a bootstrap model popup, next I correct it and open jQuery bootstrap popup like this, $('#demoModal').modal('Show');.

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