Hi, i have installed after effects cc 2015 version 13.5.
also i have plugin Duik for animations.
i created bones for object but cant select.
video where tutorial author selecting this objects: Tutorial 01 - Character Rigging - YouTube at 5:49
maybe it's related and maybe it's not - but your Ae version is the first release of 2015 and since then there were a few very important updates to fix all the bugs. you should really be using 13.7.1 on Windows or 13.7.2 on Mac. it's a good practice to always use the latest update of every release.
wierd but fixed by re-importing illustrator file.