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This issue might occur if you don't add references for your Jquery , SPService , So make sure that you have the following references in your script.

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
    
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery.SPServices/2014.02/jquery.SPServices-2014.02.min.js"></script>


<script language="javascript" type="text/javascript">
    $(document).ready(function() {
        $().SPServices.SPAutocomplete({    
            sourceList: "Country",
            sourceColumn: "Title",
            columnName: "FilterTextBox",
            ignoreCase: true,
            numChars: 3,
            slideDownSpeed: 1000,
            debug: true
        });
    });
</script>