Custom Civ Mods all crash on Loading Screen

[TopSecretPorkChop]

Every mod (Civ 6) I've tried that adds a custom Civilization crashes on the loading screen right after the "Start Game" message shows up. (I believe it may be at the when it loads the Leader Screen.) A dialog pops up reporting error 3045188730.

Any ideas why this might be, or how I can fix it. I'd really like to be able to run some custom civs.

BTW: Windows defender is turned off, so its not that.