Chingis
Chieftain
So I really like the 18 civs scenario, but I really want to keep the map, and just edit the civilizations and the starting locations. Can someone please tell me what i need to do? 

You need to activate python exceptions in your Civ4.ini.
If you've done that, you should get some sort of error message while the map loads.
This error message refers to a line in Python\PyWB\CvWBDesc.py.
The error is NOT in this file.
This is the file which loads the WB file, and the error will tell you at which part it crashes.
Take a look at the mentioned line in the file (and probably the one before), and you should get roughly a clue, where the problem is, and should then re-examine your latest addition, if it might have a problem with the mentioned thingy.
You must have written it wrong.
Sure that it's only LOGAN? Should it not be LEADER_LOGAN, or something like that?
TeamID=18
Tech=TECH_AGRICULTURE
Tech=TECH_HUNTING
ContactWithTeam=18
RevealMap=0
Team=18
LeaderType=LEADER_LOGAN
LeaderName=Logan
CivDesc=Iroquois Empire
CivShortDesc=TXT_KEY_CIV_IROQUOIS_SHORT_DESC
CivAdjective=TXT_KEY_CIV_IROQUOIS_ADJECTIVE
FlagDecal=Art/Interface/TeamColor/FlagDECAL_Iroquois.dds
WhiteFlag=1
CivType=CIVILIZATION_IROQUOIS
Color=PLAYERCOLOR_GREEN_AND_BLACK
ArtStyle=ARTSTYLE_NATIVE_AMERICA
PlayableCiv=1
MinorNationStatus=0
StartingGold=0
StartingX=37, StartingY=49
StateReligion=
StartingEra=ERA_ANCIENT
RandomStartLocation=true
CivicOption=CIVICOPTION_GOVERNMENT, Civic=CIVIC_DESPOTISM
CivicOption=CIVICOPTION_LEGAL, Civic=CIVIC_BARBARISM
CivicOption=CIVICOPTION_LABOR, Civic=CIVIC_TRIBALISM
CivicOption=CIVICOPTION_ECONOMY, Civic=CIVIC_DECENTRALIZATION
CivicOption=CIVICOPTION_RELIGION, Civic=CIVIC_PAGANISM
Handicap=HANDICAP_NOBLE
What errors do you now get?
Can't, don't have the mod.
In general it means that something in the spelling is still wrong. Check the related leaderheadInfos/CivilizationInfos.xml for the correct spelling.
Another thing:
- Random starting locations are in this map off
- all other civs have a city/units on the map
- your civ doesn't. Means it starts without anything -> instant death
Either:
- You activate random starting positions. Not sure if that's possible for only one civ, don't think so
- or you plug some units/a city somewhere on the map. Where doesn't really matter I think, because as soon as it loads you can edit it with the WB if you don't like the location
Why do you want them to start in the ocean (StartingX=37, StartingY=49)?
BeginPlot
x=37,y=49
TerrainType=TERRAIN_OCEAN
PlotType=3
EndPlot
I don't have LOR so I didn't start a game. I just searched for x37 & y49:
Code:BeginPlot x=37,y=49 TerrainType=TERRAIN_OCEAN PlotType=3 EndPlot
Playing which civ?
Because the starting location in the ocean is a cause of instant defeat.