I just realized that you're not referencing jQuery. You should only use one reference to SPServices, either the minified or non-minified file; you're referencing both and not jQuery:
Take a look at the instructions at the bottom of the main documentation page:
https://spservices.codeplex.com/documentation
M.
<scriptlanguage="javascript"type="text/javascript"src="/Shared%20Documents/jQuery-1.10.2.min.js"></script><scriptlanguage="javascript"type="text/javascript"src="/Shared%20Documents/jquery.SPServices-2013.01.min.js"></script>
https://spservices.codeplex.com/documentation
M.