A little crash with summoning monsters

History: UObject::execClassContext <- (DruidMonsterMasterArtifactMonsterSummon DM-Goliath.DruidMonsterMasterArtifactMonsterSummon @ Function DruidsRPG200.DruidArtifactMonsterSummon.PostBeginPlay : 001A) <- UObject::ProcessEvent <- (DruidMonsterMasterArtifactMonsterSummon DM-Goliath.DruidMonsterMasterArtifactMonsterSummon, Function DruidsRPG200.DruidArtifactMonsterSummon.PostBeginPlay) <- ULevel::SpawnActor <- (DruidMonsterMasterArtifactMonsterSummon) <- UObject::execClassContext <- (RPGStatsInv DM-Goliath.RPGStatsInv @ Function UT2004RPG.RPGStatsInv.Tick : 00BA) <- UObject::ProcessEvent <- (RPGStatsInv DM-Goliath.RPGStatsInv, Function UT2004RPG.RPGStatsInv.Tick) <- AActor::Tick <- TickAllActors <- ULevel::Tick <- (NetMode=3) <- TickLevel <- UGameEngine::Tick <- Level Goliath <- UpdateWorld <- MainLoop <- FMallocWindows::Free <- FMallocWindows::Realloc <- 10910191 0 FArray <- FArray::Realloc <- 0*2 <- FMallocWindows::Free

Sorry for that long piece of error, but there it is. Everytime my friend summons a monster, it fails and crashes. Anybody know how it can be fixed?

See this thread.
Probably incompatible version of UT2004RPG.

Thank you Szlat