Warhammer 40k Sync Error

Everytime we do a lan game. Mods or not we have a Sync-error. then says
Debugg.dll is the break point.

heres the error
DarkCrusade.exe caused a Breakpoint in module Debug.dll at 001b:00241da8.
Error occurred at 1/21/2007 20:53:44.
DarkCrusade.exe, run by Eric.
Microsoft Windows XP?.
1 processor(s), type 586.
1024 MBytes physical memory.

MiniDump saved to file 'C:\Program Files\DOW Dark Crusade\Dawn of War - Dark Crusade\1-21-2007_20_53_44_MiniDump.dmp'

Registers:
EAX=0024de10 CS=001b EIP=00241da8 EFLGS=00200286
EBX=00b5f548 SS=0023 ESP=00b5f358 EBP=00b5fe60
ECX=7c810173 DS=0023 ESI=00000004 FS=003b
EDX=7c90eb00 ES=0023 EDI=00000000 GS=0000
Bytes at CS:EIP:
cc 8d 8c 24 e8 00 00 00 c7 84 24 04 0b 00 00 ff