A REALLY weird bug, seems to be similar to an old one you found using the Communitas AI&Tools, but, not?
Basically, I can use CEP with IGE no problem, but if I add on Civ IV diplomacy Options every time I click IGE I get an error,
IGE couldn't start, probably because of another mod.
Please report it on Steam or Civfanatics with the error below and the mod name so I can fix it quickly.
<Skull> line C:\Users]Atros\Documents\My Games\Sid Meier's Civilization 5\MODS\Communitas AI and Tools (v 3)\Tools\TooltipWriter\TW_Init.lua:123: attempt to index a nil value
I can add some other mods fine (RED, diplomacy values, Really Advanced Setup, Less Warmonger Hate) in any combination and nothing happens, but if I add in Civ IV diplomacy mods it breaks; Not sure if I'm explaining well, so some examples:
Communitas+IGE = Works great!
Communitas + CivIV diplomacy = Works great!
Communitas + IGE + CivIVDiplomacy = Error
IGE + CivIVDiplomacy = Works Great!
No combination of the other mods I mentioned seems to have any impact on the error, so its something about how IGE plays with Communitas WITH other mods, and I honestly don't know if this is the best thread to report it to, but since there was a similar error you found that you were able to fix by talking with CEP's maker last time, I figured this might be a good spot.
Oh, things like gamesize and such seem to have no impact either, I came across the bug playing in Huge, but making other sizes repro'd it the same.
Patch 1.0.3.144, got the sid meiers Gold edition initially so have all the DLC that came with that and both expansions (I think that just means I have it all?)
I'll add attachments with logs in a minute just in case you need them, just never had them enabled and wanted to get this post made before I lost the exact error (Couldn't copy paste it)
If you need others tell me, I'll see about getting them.