recurrent CTD, please help using WinDbg

[wotan321]

I am playing the 1939 WW2 mod, I have made changes, and I am getting a CTD whenever I go to war.

I have used WinDbg, and I get the following report regarding the error.

I am not a programmer. Can anyone with some insight into this give me some help? What needs to be corrected?

FAULTING_IP:
+4d5f5945
4d5f5945 ?? ???

EXCEPTION_RECORD: ffffffff -- (.exr 0xffffffffffffffff)
ExceptionAddress: 4d5f5945
ExceptionCode: c000001d (Illegal instruction)
ExceptionFlags: 00000000
NumberParameters: 0

PROCESS_NAME: Civ4BeyondSword.exe

ERROR_CODE: (NTSTATUS) 0xc000001d - {EXCEPTION} Illegal Instruction An attempt was made to execute an illegal instruction.

APPLICATION_VERIFIER_FLAGS: 0

LAST_CONTROL_TRANSFER: from 05f9cd96 to 4d5f5945

STACK_TEXT:
WARNING: Frame IP not in any known module. Following frames may be wrong.
0012fb7c 05f9cd96 00000001 00000007 20373424 0x4d5f5945
0012fb8c 05fad8e6 04aa8f48 02241558 00000004 CvGameCoreDLL!CvPlot::isLayoutDirty+0xe6
0012fbd0 05f60c16 00000001 000005a8 0224a138 CvGameCoreDLL!CvPlot::erase+0x1c56
00000000 00000000 00000000 00000000 00000000 CvGameCoreDLL!CvPlayer::getBestAttackUnitName+0x10 6


STACK_COMMAND: ~0s; .ecxr ; kb

FAULTING_THREAD: 000000e0

DEFAULT_BUCKET_ID: STATUS_ILLEGAL_INSTRUCTION

PRIMARY_PROBLEM_CLASS: STATUS_ILLEGAL_INSTRUCTION

BUGCHECK_STR: APPLICATION_FAULT_STATUS_ILLEGAL_INSTRUCTION

FAILED_INSTRUCTION_ADDRESS:
+4d5f5945
4d5f5945 ?? ???

FOLLOWUP_IP:
CvGameCoreDLL!CvPlot::isLayoutDirty+e6
05f9cd96 834704ff add dword ptr [edi+4],0FFFFFFFFh

SYMBOL_STACK_INDEX: 1

SYMBOL_NAME: CvGameCoreDLL!CvPlot::isLayoutDirty+e6

FOLLOWUP_NAME: MachineOwner

MODULE_NAME: CvGameCoreDLL

IMAGE_NAME: CvGameCoreDLL.dll

DEBUG_FLR_IMAGE_TIMESTAMP: 4a7f0af6

FAILURE_BUCKET_ID: CvGameCoreDLL.dll!CvPlot::isLayoutDirty_c000001d_S TATUS_ILLEGAL_INSTRUCTION

BUCKET_ID: APPLICATION_FAULT_STATUS_ILLEGAL_INSTRUCTION_BAD_I P_CvGameCoreDLL!CvPlot::isLayoutDirty+e6

Followup: MachineOwner
---------