hmm... If nothing is wrong with the leaderhead info's file, than try checking leaderhead_Civ4Civilizationinfos.xml. Perhaps something is wrong with that. Also other things to check is if the file is properly directed at the Schema. Maybe try looking at the Leaderhead_text file as well. What leaderhead are you using anyway? Me to, except I call it 'lalala' and keep it in BTS/Mods section.