Like everyone else, I also got a constant stack trace error from the server console. After teleporting to the coordinates listed by the stack trace. I found that the mod was trying to spawn a land vehicle in the river near a dock in Trelai. After I put some wooden floors onto the coordinates, the vehicle spawned in and the trace error stopped.

My server was using the Autotsar Motorclub mod which has boats included but I did not install the Aquatsar mod to prevent boats from spawning. My suspicion is the mod thinks that boats are enabled and tried to spawn in a boat on the water but since there is no Aquatsar, it got stuck spawning in something that cannot be on water.

Anyways, that is just my suspicion and it is up to UdderlyEvelyn to see if she wants to fix this bug. I hope this report has been helpful to her and to anyone with the same stack trace error.

My stack trace error log if it is any help:
STACK TRACE
-----------------------------------------
function: SpawnVehicle -- file: UdderlyVehicleRespawn_Server.lua line # 106 | MOD: Udderly Vehicle Respawn
function: ProcessScheduledSpawns -- file: UdderlyVehicleRespawn_Server.lua line # 94 | MOD: Udderly Vehicle Respawn

ERROR: General , 1705406710060> 23,519,906,396> ExceptionLogger.logException> Exception thrown java.lang.RuntimeException: __concat not defined for operands: null and " at 7539, 6628 for player "Kismet". at KahluaUtil.fail line:82.
ERROR: General , 1705406710060> 23,519,906,396> DebugLogStream.printException> Stack trace:
java.lang.RuntimeException: __concat not defined for operands: null and " at 7539, 6628 for player "Kismet".
at se.krka.kahlua.vm.KahluaUtil.fail(KahluaUtil.java:82)
at se.krka.kahlua.vm.KahluaThread.luaMainloop(KahluaThread.java:805)
at se.krka.kahlua.vm.KahluaThread.call(KahluaThread.java:163)
at se.krka.kahlua.vm.KahluaThread.pcall(KahluaThread.java:1980)
at se.krka.kahlua.vm.KahluaThread.pcallvoid(KahluaThread.java:1812)
at se.krka.kahlua.integration.LuaCaller.pcallvoid(LuaCaller.java:66)
at se.krka.kahlua.integration.LuaCaller.protectedCallVoid(LuaCaller.java:139)
at zombie.Lua.Event.trigger(Event.java:64)
at zombie.Lua.LuaEventManager.triggerEvent(LuaEventManager.java:92)
at zombie.gameStates.IngameState.updateInternal(IngameState.java:1624)
at zombie.gameStates.IngameState.update(IngameState.java:1333)
at zombie.network.GameServer.main(GameServer.java:903)