score:42

Accepted answer

Instead of highmaps, you need to use map.js module. 

<script src="//code.highcharts.com/maps/modules/map.js"></script>

Here is the documentation on using both together.

score:1

I encountered the same issue, and resolved it by placing highcharts after the maps

<script src="http://code.highcharts.com/maps/highmaps.js"></script>
<script src="http://code.highcharts.com/maps/modules/data.js"></script>
<script src="http://code.highcharts.com/maps/modules/exporting.js"></script>
<script src="http://code.highcharts.com/mapdata/custom/world.js"></script>
<script type="text/javascript" src="http://code.highcharts.com/highcharts.js"></script>

http://jsfiddle.net/danny_shumer/tc898kgv/2/

score:5

You must include this script tag after highcharts.js: 

<script src="https://code.highcharts.com/maps/modules/map.js"></script>

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