Thanks for the suggestion Walkingwounded; did a full purge of everything; game files, mods; appdata folder this morning and just reinstalled everything from scratch and let appdata repopulate automatically; just got home from work and booted up just fine.
It's kind of hard to read the actual error text, but it looks like it's having trouble loading a prefab of some sort. I'd recommend deleting the mod folder; verifying the integrity of your base client and then getting a fresh download of whichever Dev Build you've been playing of Darkness Falls.
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Es un poco difícil leer el texto de error real, pero parece que está teniendo problemas para cargar algún tipo de casa prefabricada. Recomiendo eliminar la carpeta mod; verificar la integridad de su cliente base y luego obtener una nueva descarga de cualquier Dev Build que haya estado jugando de Darkness Falls.