If you see a new error in XP11 after 2023, it is likely a compatibility break. You must revert to the last official XP11 aircraft version from your store account downloads page.
Here is the "long story" of its role and presence in the X-Plane community: What is the AFL Library? Afl Library X Plane 11
: Like similar libraries, it utilizes 3D modeling to replace generic default assets with more detailed versions. Installation & Usage If you see a new error in XP11
import numpy as np
Because "AFL Library" is a specific third-party software plugin (primarily associated with FlightFactor or related utility plugins for managing aircraft state checklists) rather than a broad academic subject, there is no official peer-reviewed academic "paper" on it. Afl Library X Plane 11