First off, verify you have the azure-maps-spider-clusters.min.js
file in your folder (it's not shown in the screenshot).
Make sure you have the latest version of that file by pulling it from the dist
folder of the original open-source project and not from the code sample site (the code sample site may be a few versions behind the current version).
From there, check the console and network tabs of the developer tools in the browser to see if the request is being made and is successful.