I was testing on my P3Dv4.5 (I hadn't updated GSX for months because I'd read that it caused problems with this simulator version), and the scenery worked perfectly.
I decided to update to the latest version released last week (v3.7.2), and to my surprise, it's causing the error you mentioned
kmanning, and it only happens at this particular airport.
I checked the log and found that the KSDF scenery isn't loading (I've attached information and a log file as proof).
This situation is very strange, since it only happened after updating GSX and GSX L2 to the latest version, so some file was modified and has affected the functionality of this specific scenery.
We need your help,
Umberto, to locate the error and fix it soon so the scenery works again.
[00:01:59.438] Loading addon KSDF
[00:01:59.453] Addon KSDF not installed or missing one or more files, skipping.
[00:01:59.453] Traceback (most recent call last):
[00:01:59.453] File "<string>", line 130, in loadAddons
[00:01:59.453] File "<string>", line 79, in importAndCreateInstance
[00:01:59.453] ModuleNotFoundError: No module named 'KSDF'
Thanks and regards.