The documentation link in the CacheBox box.json is out of date. The line of code in question is visible here:
https://github.com/ColdBox/coldbox-platform/blob/development/box-cachebox.json#L10
It currently reads: http://wiki.coldbox.org/wiki/CacheBox.cfm
It needs to read: cachebox.ortusbooks.com
Update that line in the box.json so it reads like so: