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Disconnecting connId=0 to prevent exploits from an Exception in MessageHandler: UnassignedReferenceException The variable selectionLocations of NetworkManagerMMO has not been assigned.
You probably need to assign the selectionLocations variable of the NetworkManagerMMO script in the inspector.
  at (wrapper managed-to-native) UnityEngine.Transform.get_childCount(UnityEngine.Transform)
  at NetworkManagerMMO.ClearPreviews () [0x00016] in /Users/kibe/Downloads/Kusanagi-main/Assets/Scripts/NetworkManagerMMO.cs:298 
  at NetworkManagerMMO.OnClientCharactersAvailable (CharactersAvailableMsg message) [0x00032] in /Users/kibe/Downloads/Kusanagi-main/Assets/Scripts/NetworkManagerMMO.cs:311 
  at Mirror.NetworkClient+<>c__DisplayClass46_0`1[T].<RegisterHandler>g__HandlerWrapped|0 (Mirror.NetworkConnection _, T value) [0x00000] in /Users/kibe/Downloads/Kusanagi-main/Assets/Plugins/Mirror/Runtime/NetworkClient.cs:453 
  at Mirror.MessagePacking+<>c__DisplayClass7_0`2[T,C].<WrapHandler>g__Wrapped|0 (C conn, T msg, System.Int32 _) [0x00000] in /Users/kibe/Downloads/Kusanagi-main/Assets/Plugins/Mirror/Runtime/MessagePacking.cs:136 
  at Mirror.MessagePacking+<>c__DisplayClass6_0`2[T,C].<WrapHandler>b__0 (Mirror.NetworkConnection conn, Mirror.NetworkReader reader, System.Int32 channelId) [0x0007a] in /Users/kibe/Downloads/Kusanagi-main/Assets/Plugins/Mirror/Runtime/MessagePacking.cs:119 
UnityEngine.Debug:LogError (object)
Mirror.MessagePacking/<>c__DisplayClass6_0`2<CharactersAvailableMsg, Mirror.NetworkConnection>:<WrapHandler>b__0 (Mirror.NetworkConnection,Mirror.NetworkReader,int) (at Assets/Plugins/Mirror/Runtime/MessagePacking.cs:123)
Mirror.NetworkClient:UnpackAndInvoke (Mirror.NetworkReader,int) (at Assets/Plugins/Mirror/Runtime/NetworkClient.cs:275)
Mirror.NetworkClient:OnTransportData (System.ArraySegment`1<byte>,int) (at Assets/Plugins/Mirror/Runtime/NetworkClient.cs:343)
Mirror.LocalConnectionToServer:Update () (at Assets/Plugins/Mirror/Runtime/LocalConnections.cs:122)
Mirror.NetworkClient:NetworkLateUpdate () (at Assets/Plugins/Mirror/Runtime/NetworkClient.cs:1356)
Mirror.NetworkLoop:NetworkLateUpdate () (at Assets/Plugins/Mirror/Runtime/NetworkLoop.cs:205)