Modal not working giving an error modal is not a function

I am getting an error in browser debugger " TypeError: $(…).modal is not a function"

JS file included are:

<script src="./resources/plugins/jQuery/jQuery-2.1.4.min.js"></script> <script src="./resources/plugins/jQueryUI/jquery-ui.min.js" type="text/javascript"></script> <script src="./resources/bootstrap/js/bootstrap.min.js" type="text/javascript"></script>

all the files included without an error.

I am calling the modal as follows

var options = {
        "backdrop" : "static",
        "show":true
    }
$('#modalPopup').modal(options);

The model html is as follows:

    <div class="modal fade" id ="modalPopup" 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">×</button>
            <h4 class="modal-title">Modal title</h4>
          </div>
          <div class="modal-body">
            <p>One fine body</p>
          </div>
          <div class="modal-footer">
            <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
            <button type="button" class="btn btn-primary">Save changes</button>
          </div>
        </div><!-- /.modal-content -->
      </div><!-- /.modal-dialog -->
    </div><!-- /.modal -->
    <!-- ============= info popup ============= -->

I am trying to figure out what I am doing wring? Can anyone help?

Thanks in advance,

Kumar