CTD (Unexpected Error) on Cuman Khanate's Turn

[PapaRosario]

I have Win7, SS 6.4 Late Era, Kingdoms patched to the latest patch on Steam, and I have no submods. My error log says something about the hidden resource riga.

Spoiler Alert, click show to read: 

23:38:10.959 [system.rpt] [always] CPU: SSE2
23:38:10.960 [system.rpt] [always] ==== system log start, build date: Feb 25 2008 version development ===
23:38:10.964 [system.io] [always] mounted pack packs/data_0.pack
23:38:10.964 [system.io] [always] mounted pack packs/data_1.pack
23:38:10.965 [system.io] [always] mounted pack packs/data_2.pack
23:38:10.967 [system.io] [always] mounted pack packs/data_3.pack
23:38:10.967 [system.io] [always] mounted pack packs/data_4.pack
23:38:10.968 [system.io] [always] mounted pack packs/localized.pack
23:38:47.774 [script.err] [error] Script Error in mods/SS6.3/data/world/maps/base/descr_regions.txt, at line 65, column 48
Unrecognised: 'riga' as a region resource class (or hidden resource)
23:39:12.561 [system.rpt] [error] Medieval 2: Total War encountered an unspecified error and will now exit.

I checked descr_region and saw that riga was listed as a hidden resource for the Riga province. I then checked at the top of EDB and didn't see the riga hidden resource listed there, so I thought that might be a problem with a discrepancy in hidden resources between descr_regions and EDB. So I added riga to the hidden resource list at the top of EDB, but then I ended up getting another CTD.

Edit: Oops, I meant unspecified error in the title. Not unexpected error.
Edit 2: Also, this is after hitting end turn on turn 34.

[PapaRosario]

So I think it was actually the Mongols and not the Cumans that were causing problems. I used the surrender_regions cheat on the Cumans to see if that would fix things and I still got the CTD. I reloaded and used it on the Mongols instead, and it worked. I think I'll just continue to play like this without the Mongols. Hopefully it doesn't bite me in the ass later.

I would still like to know why I got the CTD if anyone has any idea. Thanks.