Attaching Stacktrace:
IPv6 Should be on the last Error (Invalid Cast Exception)

(Filename: C:/Users//*/BattleClient.cs Line: 39)

Let's connect the client!
UnityEngine.DebugLogHandler:Internal_Log(LogType, String, Object)
UnityEngine.DebugLogHandler:LogFormat(LogType, Object, String, Object[])
UnityEngine.Logger:Log(LogType, Object)
UnityEngine.Debug:Log(Object)
<Start>c__Iterator0:MoveNext() (at C:*****\Assets\Code\Networking\BattleClient.cs:44)
UnityEngine.SetupCoroutine:InvokeMoveNext(IEnumerator, IntPtr)

(Filename: C:///BattleClient.cs Line: 44)

System memory in use before: 261.0 MB.
System memory in use after: 223.2 MB.

Unloading 24 unused Assets to reduce memory usage. Loaded Objects now: 1874.
Total: 5.725704 ms (FindLiveObjects: 0.700780 ms CreateObjectMapping: 0.042195 ms MarkObjects: 0.987023 ms DeleteObjects: 3.994849 ms)

WebSocketSharp Open!
UnityEngine.DebugLogHandler:Internal_Log(LogType, String, Object)
UnityEngine.DebugLogHandler:LogFormat(LogType, Object, String, Object[])
UnityEngine.Logger:Log(LogType, Object)
UnityEngine.Debug:Log(Object)
<Connect>c__Iterator1:<>m__1(Object, EventArgs) (at C:*****\Assets\Plugins\WebSocket\WebSocket.cs:245)
WebSocketSharp.Ext:Emit(EventHandler, Object, EventArgs)
WebSocketSharp.WebSocket:open()
WebSocketSharp.<ConnectAsync>c__AnonStorey10:<>m__C(IAsyncResult)
System.Runtime.Remoting.Messaging.AsyncResult:Invoke(AsyncResult)
System.Runtime.Remoting.Messaging.AsyncResult:System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
System.Threading.ThreadPoolWorkQueue:Dispatch()
System.Threading._ThreadPoolWaitCallback:PerformWaitCallback()

(Filename: C:/*****/Assets/Plugins/WebSocket/WebSocket.cs Line: 245)

Let's join the room!
UnityEngine.DebugLogHandler:Internal_Log(LogType, String, Object)
UnityEngine.DebugLogHandler:LogFormat(LogType, Object, String, Object[])
UnityEngine.Logger:Log(LogType, Object)
UnityEngine.Debug:Log(Object)
<Start>c__Iterator0:MoveNext() (at C:*****\Assets\Code\Networking\BattleClient.cs:47)
UnityEngine.SetupCoroutine:InvokeMoveNext(IEnumerator, IntPtr)

(Filename: C:///BattleClient.cs Line: 47)

Connected to server. Client id: BJEY7TXVQ
UnityEngine.DebugLogHandler:Internal_Log(LogType, String, Object)
UnityEngine.DebugLogHandler:LogFormat(LogType, Object, String, Object[])
UnityEngine.Logger:Log(LogType, Object)
UnityEngine.Debug:Log(Object)
BattleClient:OnOpenHandler(Object, EventArgs) (at C:*\Assets\Code\Networking\BattleClient.cs:81)
Colyseus.Client:ParseMessage(Byte[]) (at C:*\Assets\Plugins\Colyseus\Client.cs:191)
Colyseus.Client:Recv() (at C:*\Assets\Plugins\Colyseus\Client.cs:84)
<Start>c__Iterator0:MoveNext() (at C:*\Assets\Code\Networking\BattleClient.cs:73)
UnityEngine.SetupCoroutine:InvokeMoveNext(IEnumerator, IntPtr)

(Filename: C:///BattleClient.cs Line: 81)

Ready to connect to room!
UnityEngine.DebugLogHandler:Internal_Log(LogType, String, Object)
UnityEngine.DebugLogHandler:LogFormat(LogType, Object, String, Object[])
UnityEngine.Logger:Log(LogType, Object)
UnityEngine.Debug:Log(Object)
<Start>c__Iterator0:<>m__1(Object, EventArgs) (at C:*\Assets\Code\Networking\BattleClient.cs:53)
Colyseus.Room:SetConnection(Connection) (at C:*\Assets\Plugins\Colyseus\Room.cs:108)
Colyseus.Client:ParseMessage(Byte[]) (at C:*\Assets\Plugins\Colyseus\Client.cs:203)
Colyseus.Client:Recv() (at C:*\Assets\Plugins\Colyseus\Client.cs:84)
<Start>c__Iterator0:MoveNext() (at C:*****\Assets\Code\Networking\BattleClient.cs:73)
UnityEngine.SetupCoroutine:InvokeMoveNext(IEnumerator, IntPtr)

(Filename: C:///BattleClient.cs Line: 53)

WebSocketSharp Open!
UnityEngine.DebugLogHandler:Internal_Log(LogType, String, Object)
UnityEngine.DebugLogHandler:LogFormat(LogType, Object, String, Object[])
UnityEngine.Logger:Log(LogType, Object)
UnityEngine.Debug:Log(Object)
<Connect>c__Iterator1:<>m__1(Object, EventArgs) (at C:*****\Assets\Plugins\WebSocket\WebSocket.cs:245)
WebSocketSharp.Ext:Emit(EventHandler, Object, EventArgs)
WebSocketSharp.WebSocket:open()
WebSocketSharp.<ConnectAsync>c__AnonStorey10:<>m__C(IAsyncResult)
System.Runtime.Remoting.Messaging.AsyncResult:Invoke(AsyncResult)
System.Runtime.Remoting.Messaging.AsyncResult:System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
System.Threading.ThreadPoolWorkQueue:Dispatch()
System.Threading._ThreadPoolWaitCallback:PerformWaitCallback()

(Filename: C:/*****/Assets/Plugins/WebSocket/WebSocket.cs Line: 245)

InvalidCastException: Specified cast is not valid.
at Colyseus.Room.ParseMessage (System.Byte[] recv) [0x00029] in C:*\Assets\Plugins\Colyseus\Room.cs:153
at Colyseus.Room.Recv () [0x00016] in C:*\Assets\Plugins\Colyseus\Room.cs:83
at Colyseus.Client.Recv () [0x0003e] in C:*\Assets\Plugins\Colyseus\Client.cs:89
at BattleClient+<Start>c__Iterator0.MoveNext () [0x002bb] in C:**\Assets\Code\Networking\BattleClient.cs:73
at UnityEngine.SetupCoroutine.InvokeMoveNext (System.Collections.IEnumerator enumerator, System.IntPtr returnValueAddress) [0x00027] in <e3b5432eb0ec46cea77514145fd3cca9>:0

(Filename: <e3b5432eb0ec46cea77514145fd3cca9> Line: 0)*

Topics created by darvath