SPServices is not working in SharePoint 2013 Master Page

Hi,

I am referencing the SPServices in SharePoint 2013 custom Master Page.

<script type="text/javascript" src="../SiteAssets/js/jquery.js"></script><!--  <script type="text/javascript" src="../SiteAssets/js/menu.js"></script>--><script type="text/javascript" src="../SiteAssets/js/jquery.SPServices-0.7.2.js"></script><script type="text/javascript">

Except SPService other files are working properly. But i am not able to perform the operations of SPService.

Unable to get property 'SPGetCurrentUser' of undefined or null reference

Please let me know how can i solve this issue?