CTD when starting a battle

[The Computer Illiterate]

When starting a siege battle near oslo when playing as the kingdom of leon with byzantine allies (don't ask how they got there...) against kingdom of norway. I'm using windows 7 and I also tried using the really bad AI and the G5 fix but to no avail. The turn is 182. I have had other problems like this occasionally but I've always auto-resolved and went on my way.

I have SS 6.4 and kingdoms 1.5

Spoiler Alert, click show to read: 

06:57:43.221 [system.rpt] [always] CPU: SSE2
06:57:43.222 [system.rpt] [always] ==== system log start, build date: Feb 25 2008 version development ===
06:57:43.225 [system.io] [always] mounted pack packs/data_0.pack
06:57:43.226 [system.io] [always] mounted pack packs/data_1.pack
06:57:43.227 [system.io] [always] mounted pack packs/data_2.pack
06:57:43.227 [system.io] [always] mounted pack packs/data_3.pack
06:57:43.228 [system.io] [always] mounted pack packs/data_4.pack
06:57:43.228 [system.io] [always] mounted pack packs/localized.pack
07:10:25.352 [game.script] [error] Script execution error for <label_unit>, at line 12612, in mods/SS6.3/data/world/maps/campaign/imperial_campaign/campaign_script.txt:
label_unit referenced non-existent unit
07:10:25.353 [game.script] [error] Script execution error for <label_unit>, at line 12613, in mods/SS6.3/data/world/maps/campaign/imperial_campaign/campaign_script.txt:
label_unit referenced non-existent unit
07:10:25.353 [game.script] [error] Script execution error for <label_unit>, at line 12614, in mods/SS6.3/data/world/maps/campaign/imperial_campaign/campaign_script.txt:
label_unit referenced non-existent unit
07:10:25.354 [game.script] [error] Script execution error for <label_unit>, at line 12615, in mods/SS6.3/data/world/maps/campaign/imperial_campaign/campaign_script.txt:
label_unit referenced non-existent unit
07:10:25.354 [game.script] [error] Script execution error for <label_unit>, at line 12616, in mods/SS6.3/data/world/maps/campaign/imperial_campaign/campaign_script.txt:
label_unit referenced non-existent unit
07:10:25.358 [game.script] [error] Script execution error for <define_unit_group>, at line 12619, in mods/SS6.3/data/world/maps/campaign/imperial_campaign/campaign_script.txt:
Error in battle script command 'define_unit_group': invalid unit label 'unit34'.
07:10:25.358 [game.script] [error] Script execution error for <define_unit_group>, at line 12619, in mods/SS6.3/data/world/maps/campaign/imperial_campaign/campaign_script.txt:
Error in battle script command 'define_unit_group': invalid unit label 'unit35'.
07:10:25.359 [game.script] [error] Script execution error for <define_unit_group>, at line 12619, in mods/SS6.3/data/world/maps/campaign/imperial_campaign/campaign_script.txt:
Error in battle script command 'define_unit_group': invalid unit label 'unit36'.
07:10:25.359 [game.script] [error] Script execution error for <define_unit_group>, at line 12619, in mods/SS6.3/data/world/maps/campaign/imperial_campaign/campaign_script.txt:
Error in battle script command 'define_unit_group': invalid unit label 'unit37'.
07:10:25.359 [game.script] [error] Script execution error for <define_unit_group>, at line 12619, in mods/SS6.3/data/world/maps/campaign/imperial_campaign/campaign_script.txt:
Error in battle script command 'define_unit_group': invalid unit label 'unit38'.
07:10:31.492 [game.script] [error] Script execution error for <label_unit>, at line 12742, in mods/SS6.3/data/world/maps/campaign/imperial_campaign/campaign_script.txt:
label_unit referenced non-existent army
07:10:31.492 [game.script] [error] Script execution error for <label_unit>, at line 12743, in mods/SS6.3/data/world/maps/campaign/imperial_campaign/campaign_script.txt:
label_unit referenced non-existent army
07:10:31.492 [game.script] [error] Script execution error for <label_unit>, at line 12744, in mods/SS6.3/data/world/maps/campaign/imperial_campaign/campaign_script.txt:
label_unit referenced non-existent army
07:10:31.493 [game.script] [error] Script execution error for <label_unit>, at line 12745, in mods/SS6.3/data/world/maps/campaign/imperial_campaign/campaign_script.txt:
label_unit referenced non-existent army
07:10:31.493 [game.script] [error] Script execution error for <label_unit>, at line 12746, in mods/SS6.3/data/world/maps/campaign/imperial_campaign/campaign_script.txt:
label_unit referenced non-existent army
07:10:31.493 [game.script] [error] Script execution error for <label_unit>, at line 12747, in mods/SS6.3/data/world/maps/campaign/imperial_campaign/campaign_script.txt:
label_unit referenced non-existent army
07:10:31.493 [game.script] [error] Script execution error for <label_unit>, at line 12748, in mods/SS6.3/data/world/maps/campaign/imperial_campaign/campaign_script.txt:
label_unit referenced non-existent army
07:10:31.493 [game.script] [error] Script execution error for <label_unit>, at line 12749, in mods/SS6.3/data/world/maps/campaign/imperial_campaign/campaign_script.txt:
label_unit referenced non-existent army
07:10:31.493 [game.script] [error] Script execution error for <label_unit>, at line 12750, in mods/SS6.3/data/world/maps/campaign/imperial_campaign/campaign_script.txt:
label_unit referenced non-existent army
07:10:31.493 [game.script] [error] Script execution error for <label_unit>, at line 12751, in mods/SS6.3/data/world/maps/campaign/imperial_campaign/campaign_script.txt:
label_unit referenced non-existent army
07:10:31.493 [game.script] [error] Script execution error for <label_unit>, at line 12752, in mods/SS6.3/data/world/maps/campaign/imperial_campaign/campaign_script.txt:
label_unit referenced non-existent army
07:10:31.493 [game.script] [error] Script execution error for <label_unit>, at line 12753, in mods/SS6.3/data/world/maps/campaign/imperial_campaign/campaign_script.txt:
label_unit referenced non-existent army
07:10:31.493 [game.script] [error] Script execution error for <label_unit>, at line 12754, in mods/SS6.3/data/world/maps/campaign/imperial_campaign/campaign_script.txt:
label_unit referenced non-existent army
07:10:31.493 [game.script] [error] Script execution error for <label_unit>, at line 12755, in mods/SS6.3/data/world/maps/campaign/imperial_campaign/campaign_script.txt:
label_unit referenced non-existent army
07:10:31.493 [game.script] [error] Script execution error for <label_unit>, at line 12756, in mods/SS6.3/data/world/maps/campaign/imperial_campaign/campaign_script.txt:
label_unit referenced non-existent army
07:10:31.494 [game.script] [error] Script execution error for <label_unit>, at line 12757, in mods/SS6.3/data/world/maps/campaign/imperial_campaign/campaign_script.txt:
label_unit referenced non-existent army
07:10:31.494 [game.script] [error] Script execution error for <label_unit>, at line 12758, in mods/SS6.3/data/world/maps/campaign/imperial_campaign/campaign_script.txt:
label_unit referenced non-existent army
07:10:31.494 [game.script] [error] Script execution error for <label_unit>, at line 12759, in mods/SS6.3/data/world/maps/campaign/imperial_campaign/campaign_script.txt:
label_unit referenced non-existent army
07:10:31.494 [game.script] [error] Script execution error for <label_unit>, at line 12760, in mods/SS6.3/data/world/maps/campaign/imperial_campaign/campaign_script.txt:
label_unit referenced non-existent army
07:10:31.494 [game.script] [error] Script execution error for <label_unit>, at line 12761, in mods/SS6.3/data/world/maps/campaign/imperial_campaign/campaign_script.txt:
label_unit referenced non-existent army
07:10:31.494 [game.script] [error] Script execution error for <label_unit>, at line 12783, in mods/SS6.3/data/world/maps/campaign/imperial_campaign/campaign_script.txt:
label_unit referenced non-existent unit
07:10:31.494 [game.script] [error] Script execution error for <define_unit_group>, at line 12785, in mods/SS6.3/data/world/maps/campaign/imperial_campaign/campaign_script.txt:
Error in battle script command 'define_unit_group': invalid unit label 'General3'
07:10:31.494 [game.script] [error] Script execution error for <define_unit_group>, at line 12786, in mods/SS6.3/data/world/maps/campaign/imperial_campaign/campaign_script.txt:
Error in battle script command 'define_unit_group': invalid unit label 'unit76'.
07:10:32.656 [system.rpt] [error] Medieval 2: Total War encountered an unspecified error and will now exit.

[Melooo182]

those BAI logs are 'normal' according to G5 those label_unit errors are harmless and probably not related to the CTD at all

If you can get a list of the units involved in the battle it would be of much help...if the CTD is a soon as the loading bar finishes it could be one of the units having a corrupted mesh or texture...if the CTD is during the fight then is more likely culprit of BAI.

[The Computer Illiterate]

The crash occurs pretty much immediately after clicking 'start battle' after deployment. I'll look into the units used.

[Losthief]

The crash occurs pretty much immediately after clicking 'start battle' after deployment. I'll look into the units used.

i might be wrong, but try waiting a turn then playing the battle