I was using "build & restart". I've done that many times since deactivating the chat. Now though, it's not showing that error about the chat either.
I first disabled the chat immediately after installing it over a week ago. I've done the rebuild and reload more than a dozen times since then. So that's really weird. I didn't see the icon for it after disabling it, but I was getting those errors in the browser console.
Only thing I can think is that most of the "rebuild & reload" where clicking the notification in the bottom left that said to do so rather than from the main dashboard page.
Keep in mind that this utilises new features not available in NodeBB versions until v0.0.7, so admins may want to git pull before installing and activating this module. Otherwise, the smilies will simply point to 404 pages.