And some info I got from ZeroKLobbyErrors.txt
Replace !angle_bracket_open! by the real thing and dito for !angle_bracket_close! (good God, havent you people ever heard of proper HTML escaping user input and output to the user?)
===============
13-8-2015 21:26
System.NullReferenceException: Object reference not set to an instance of an object.
at ZeroKLobby.ZklSteamHandler.!angle_bracket_open!.ctor!angle_bracket_close!b__15_2(Object sender, OldNewPair`1 args)
at System.EventHandler`1.Invoke(Object sender, TEventArgs e)
at LobbyClient.TasClient.!angle_bracket_open!Process!angle_bracket_close!d__252.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at CallSite.Target(Closure , CallSite , Object )
at LobbyClient.TasClient.!angle_bracket_open!OnCommandReceived!angle_bracket_close!d__31.MoveNext()
===============
13-8-2015 21:27
System.NullReferenceException: Object reference not set to an instance of an object.
at ZeroKLobby.ZklSteamHandler.!angle_bracket_open!.ctor!angle_bracket_close!b__15_2(Object sender, OldNewPair`1 args)
at System.EventHandler`1.Invoke(Object sender, TEventArgs e)
at LobbyClient.TasClient.!angle_bracket_open!Process!angle_bracket_close!d__252.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at CallSite.Target(Closure , CallSite , Object )
at LobbyClient.TasClient.!angle_bracket_open!OnCommandReceived!angle_bracket_close!d__31.MoveNext()
===============
13-8-2015 21:27
System.NullReferenceException: Object reference not set to an instance of an object.
at ZeroKLobby.ZklSteamHandler.!angle_bracket_open!.ctor!angle_bracket_close!b__15_2(Object sender, OldNewPair`1 args)
at System.EventHandler`1.Invoke(Object sender, TEventArgs e)
at LobbyClient.TasClient.!angle_bracket_open!Process!angle_bracket_close!d__252.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at CallSite.Target(Closure , CallSite , Object )
at LobbyClient.TasClient.!angle_bracket_open!OnCommandReceived!angle_bracket_close!d__31.MoveNext()
===============
13-8-2015 21:29
System.NullReferenceException: Object reference not set to an instance of an object.
at ZeroKLobby.ZklSteamHandler.!angle_bracket_open!.ctor!angle_bracket_close!b__15_2(Object sender, OldNewPair`1 args)
at System.EventHandler`1.Invoke(Object sender, TEventArgs e)
at LobbyClient.TasClient.!angle_bracket_open!Process!angle_bracket_close!d__252.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at CallSite.Target(Closure , CallSite , Object )
at LobbyClient.TasClient.!angle_bracket_open!OnCommandReceived!angle_bracket_close!d__31.MoveNext()