Strange problem creating new unit, plz help!

[BaneBlade81]

I did my first unit this evening,a self-propelled-howitzer following Sorovan's guide.
So i basically copied modern_armor in all relevant files, changed the name and the description, made a loadable Mod out of it. Problem is, when MOD is loading i get an:
XML error
Tag:UNITCLASS_SELF_PROPELLED_HOWITZER in Infoclass was incorrect
Current XML file is: ..Units/Civ4UnitInfos.xml

Game loads, can't build my unit. The real strange thing is, in Civilopedia there are:
1)NormalModern Armor
2)Second entry modern armor, but replaces modern armor, WTF?
3)my SelfProHoW, REPLACES GALLEY, National Unit: 77849 allowed
Team project: 49831 allowed
World Wonder: 23758 allowed
So again WTF? I didn't even changed unit stats for now, only all textreferences in german&english.
Only thing not Vanila in my configuration is BlueMarble and the unpacked Art.pak file.

Edit: deleted Blue Marble, checked all relevant files (second time now):
No double entry for modern armor, so where does this come from?
and sure as hell no replaced Galley

[Mylon]

Have you edited Civ4UnitClassInfos.xml? You have to add a similar entry.

Also, check to make sure you didn't misplace the /UnitInfos or /UnitClassInfos tag. Note the "s" in those tags, as that's very important but easy to overlook.

[BaneBlade81]

Reinstalled, repatched, crap.
After your tip Mylon i checked that i get the filenames and folderstructure, everything seems correct. Even checked the .xml files for the strange numbers occuring(national/project/teamunit), they are nowhere. Guess i will just try it from start again this evening.
Edit: Sry forgot, thx nonetheless!

[gdijedi7]

When you get this unit done, please put make it available for download. Self-propelled artillery is something I want. I hate having to wait for my very slow artillery to catch up with my blitzing armor columns