KF Critical Error every time I host a Listen Server

So every time I try to host a listen server on Killing Floor I get a critical error on the map loading screen. This doesn't happen whenever I go Solo or find a multiplayer server. Here's the report:

Build UT2004_Build_[2004-11-11_10.48]



OS: Windows NT 6.2 (Build: 9200)

CPU: AuthenticAMD Unknown processor @ 2096 MHz with 3293MB RAM

Video: AMD Radeon HD 8550G (1247)



UdpGamespyQuery KF-Clandestine.UdpGamespyQuery (Function IpDrv.UdpGamespyQuery.PreBeginPlay:0167) Assertion failed, line 58



History: FFrame::Serialize <- UObject::ProcessEvent <- (UdpGamespyQuery KF-Clandestine.UdpGamespyQuery, Function IpDrv.UdpGamespyQuery.PreBeginPlay) <- ULevel::SpawnActor <- (UdpGamespyQuery) <- UObject::ProcessEvent <- (MasterServerUplink KF-Clandestine.MasterServerUplink, Function IpDrv.MasterServerUplink.BeginPlay) <- BeginPlay <- UGameEngine::LoadMap <- LocalMapURL <- UGameEngine::Browse <- ClientTravel <- UGameEngine::Tick <- Level KF-Clandestine <- UpdateWorld <- MainLoop <- FMallocWindows::Free <- FMallocWindows::Realloc <- 726F6F6C 0 FArray <- FArray::Realloc <- 0*2 <- FMallocWindows::Free



If anyone could help me that would be amazing!:o