Hi Shiva,
Did you include 'sap.ui.table' in your bootstrap like below -
<script id="sap-ui-bootstrap" type="text/javascript" src="https://sapui5.hana.ondemand.com/1.28.8/resources/sap-ui-core.js" data-sap-ui-theme="sap_bluecrystal" data-sap-ui-libs="sap.ui.commons,sap.ui.table"> </script>
Regards,
Sai Vellanki.