Big error problem with modding...

Can anyone help me? :cry:

I am working on a personal mod that includes a self-made Huns civilization. I downloaded BBAI and modded the files in that to add the Huns civilization, texts, leader, and units. Whenever I load the mod, it comes up with this error:
(I've put big things in spoilers)




Then it repeats the above error with these units:



I checked and that is the order in which the units are listed in CIV4UnitArtStyleTypeInfos.xml

However, I checked very carefully, and nothing is wrong with that file... nothing is wrong with CIV4CivilizationInfos.xml either.

Then it pulls up another error message:



Wherever I place the Huns in my CivilizationInfos file, it gets the above error with all of the unique units that come before it. It finally finishes with the error above, replacing UNIT_AMERICAN_NAVY_SEAL with LEADER_ATTILA.

Finally, the last two error messages show:



Those are apparently references to something in GlobalDefines.
Then, when I start the game, I go to the civilopedia, and everything's messed up... it has no units, deleted lots of leaders or their pictures, and only has america, arabia, and aztecs under civilizations. when i start a custom-game, it lets me pick any leader (without my huns addition), and it lets me pick any empire up to the Huns, and the rest are gone. When i hit launch game, it immediately crashes.

if anyone knows what I can do to fix it... that would be great...