I'm making a mod that uses the normal tech tree as of right now. I added some units and strategic resources and now whenever i go to the science advisors screen the game crashes. PLZ PLZ PLZ can anyone help me. BTW I'm using Civ 3 conquests.

did you make the changes in your pediaicons.txt file?

well i assigned all the new units the same civilopedia entry identifier as one's that already eisted. EG. both the Swordsmen and Bronze Swordsmen use the PRTO_Swordsmen entry.

It sounds like one of the names may be incorrect.

Have a read of this and see if it helps:- :)
(It's written for PTW, but may be of some use with Conquests)

http://forums.civfanatics.com/showthread.php?postid=1313180#post1313180