NRE with RPC

Hi my server runs oxide and has the latest version of the dedicated server and oxide. Im getting the following errors, causing players to get kicked when interacting with the animal farm. I have included my config file in case that helps at all. 
I am using the latest version of the plugin, 1.3.5.
What can i do to fix this error?

NullReferenceException: Object reference not set to an instance of an object
  at Item.Save (System.Boolean bIncludeContainer, System.Boolean bIncludeOwners) [0x00019] in <4a8675d0fdb04a78becadde562d78f49>:0 
  at ItemContainer.Save (System.Boolean bIncludeContainer) [0x0011c] in <4a8675d0fdb04a78becadde562d78f49>:0 
  at PlayerLoot.SendUpdate () [0x000a2] in <4a8675d0fdb04a78becadde562d78f49>:0 
  at PlayerLoot.SendImmediate () [0x00021] in <4a8675d0fdb04a78becadde562d78f49>:0 
  at StorageContainer.PlayerOpenLoot (BasePlayer player, System.String panelToOpen, System.Boolean doPositionChecks) [0x000ae] in <4a8675d0fdb04a78becadde562d78f49>:0 
  at StorageContainer.RPC_OpenLoot (BaseEntity+RPCMessage rpc) [0x00021] in <4a8675d0fdb04a78becadde562d78f49>:0 
  at StorageContainer.OnRpcMessage (BasePlayer player, System.UInt32 rpc, Network.Message msg) [0x000da] in <4a8675d0fdb04a78becadde562d78f49>:0 
UnityEngine.DebugLogHandler:Internal_LogException(Exception, Object)
UnityEngine.DebugLogHandler:LogException(Exception, Object)
UnityEngine.Logger:LogException(Exception, Object)
UnityEngine.Debug:LogException(Exception)
StorageContainer:OnRpcMessage(BasePlayer, UInt32, Message)
BaseEntity:SV_RPCMessage(UInt32, Message)
ServerMgr:OnRPCMessage(Message)
ServerMgr:OnNetworkMessage(Message)
Facepunch.Network.Raknet.Server:ProcessRead(NetRead)
Network.BaseNetwork:Cycle()
ServerMgr:Update()


NullReferenceException: Object reference not set to an instance of an object
  at BasePlayer.WaterFactor (WaterLevel+WaterInfo& info) [0x0004a] in <4a8675d0fdb04a78becadde562d78f49>:0 
  at BasePlayer.WaterFactor () [0x00000] in <4a8675d0fdb04a78becadde562d78f49>:0 
  at BasePlayer.IsSwimming () [0x00000] in <4a8675d0fdb04a78becadde562d78f49>:0 
  at Oxide.Plugins.DangerousTreasures+HumanoidBrain.TryToRoam () [0x0000d] in <421c5e075b864b328939aa5c92551e07>:0 
  at InvokeHandlerBase`1[T].DoTick () [0x00138] in <1cb0c1a470524bb4a513252921982d15>:0 
  at InvokeHandlerBase`1[T].LateUpdate () [0x0001f] in <1cb0c1a470524bb4a513252921982d15>:0 

NullReferenceException: Object reference not set to an instance of an object
  at Item.Save (System.Boolean bIncludeContainer, System.Boolean bIncludeOwners) [0x00019] in <4a8675d0fdb04a78becadde562d78f49>:0 
  at ItemContainer.Save (System.Boolean bIncludeContainer) [0x0011c] in <4a8675d0fdb04a78becadde562d78f49>:0 
  at StorageContainer.Save (BaseNetworkable+SaveInfo info) [0x00027] in <4a8675d0fdb04a78becadde562d78f49>:0 
  at HitchTrough.Save (BaseNetworkable+SaveInfo info) [0x00000] in <4a8675d0fdb04a78becadde562d78f49>:0 
  at BaseNetworkable.ToStream (System.IO.Stream stream, BaseNetworkable+SaveInfo saveInfo) [0x00010] in <4a8675d0fdb04a78becadde562d78f49>:0 
  at BaseNetworkable.GetSaveCache () [0x00045] in <4a8675d0fdb04a78becadde562d78f49>:0 
  at SaveRestore+<WarmUpEntityCaches>d__23.MoveNext () [0x00091] in <4a8675d0fdb04a78becadde562d78f49>:0 
UnityEngine.DebugLogHandler:Internal_LogException(Exception, Object)
UnityEngine.DebugLogHandler:LogException(Exception, Object)
UnityEngine.Logger:LogException(Exception, Object)
UnityEngine.Debug:LogException(Exception)
<WarmUpEntityCaches>d__23:MoveNext()
UnityEngine.SetupCoroutine:InvokeMoveNext(IEnumerator, IntPtr)

AnimalFarm.json