Crash due to advances

[King Mir]

In switching in the @CIVILIZE portion of rules.txt into my game, my game shows a propensity to crash after a few turns. It used to do it after the civilization advance of the player civ, but when I saved at a later point, it started crashing earlier.

I've isolated the problem to @CIVILIZE, but I am unsure how to proceed further. What are the likely and less likely causes of the problem?

I have tools that tell me that future tech is reachable (besides, changing it to nil nil did not help), and that there are no loops. The excel table that generates the rules text should be solid.

[Harry Tuttle]

Post the rules.txt so we can have a look see.

[King Mir]

I figured out the problem.

I had incompletely swapped the location of two advances, so that the name location and derivative techs had changed, but not the prerequisite techs. Most have caused a loop. I thought my tool would catch it, but apparently not.

[curtsibling]

Yep - Most crashes in game can be traced back to tech-tree typos.