Special:Badtitle/NS90:Forum:Wiki Talk/A question on Modules

In my continuing effort to get a fully functional copy of ATT on a virtual machine I keep stumbling over a Scribunto script error: "Script error: No such module "Subpages 2"." or a similar script error from the Scribunto menu bar...

At first I thought it was Scribunto... but apparently there are several "modules" that are included in the ATT pages https://allthetropes.orain.org/wiki/Module:Subpages https://allthetropes.orain.org/wiki/Module:Subpages_2 and https://allthetropes.orain.org/wiki/Module:Subpages_3

None of these modules are documented in the sense that I have no idea where they belong or what kind of code they are (lua? php?).

Thanks in advance for your assistance!