while trying to host multiplayer game on mission/sandbox gamemode, game unloads back to the menu with this error

at Barotrauma.ItemPrefab.Find(String name, Identifier identifier) in <DEV>\Barotrauma\BarotraumaShared\SharedSource\Items\ItemPrefab.cs:line 1551
at Barotrauma.PerkBehaviors.SubItemSwapPerk.ApplyOnRoundStart(IReadOnlyCollection`1 teamCharacters, Submarine teamSubmarine) in <DEV>\Barotrauma\BarotraumaShared\SharedSource\DisembarkPerks\PerkBehaviors\SubItemSwapPerk.cs:line 44
at Barotrauma.PerkCollection.ApplyAll(IReadOnlyCollection`1 team1Characters, IReadOnlyCollection`1 team2Characters) in <DEV>\Barotrauma\BarotraumaShared\SharedSource\GameSession\GameSession.cs:line 37
at Barotrauma.Networking.GameServer.StartGame(SubmarineInfo selectedSub, SubmarineInfo selectedShuttle, Option`1 selectedEnemySub, GameModePreset selectedMode, CampaignSettings settings)+MoveNext() in <DEV>\Barotrauma\BarotraumaServer\ServerSource\Networking\GameServer.cs:line 3151
at Barotrauma.CoroutineManager.PerformCoroutineStep(CoroutineHandle handle) in <DEV>\Barotrauma\BarotraumaShared\SharedSource\CoroutineManager.cs:line 213
at Barotrauma.CoroutineManager.IsDone(CoroutineHandle handle) in <DEV>\Barotrauma\BarotraumaShared\SharedSource\CoroutineManager.cs:line 223

turned off all the other mods (except for the base THG) and it still happens