RegisterHandler() works in the editor, but not in a build

I'm trying to register handlers for custom network messages. It works flawlessly in the editor, but now when I'm doing the same on a build.

When I'm trying to register a serverside handler as this, the NetworkManager HUD's host / server button doesn't execute anything past the RegisterHandler().

Code (CSharp):

1.  
2. public class NetMessage
3. {
4.     public const short CHAT_MSG = MsgType.Highest + 1;
5.     public const short PLAYER_INFO = MsgType.Highest + 2;
6. }
7.  
8. public class Shared_NetHandler
9. {
10.     public static void Client_Register()
11.     {
12.         NetworkClient client = NetworkManagerEx.singleton.client;
13.         client.RegisterHandler(NetMessage.CHAT_MSG, Chat_Shared.Singleton.Client_ReceiveChatMessage);
14.         client.RegisterHandler(NetMessage.PLAYER_INFO, Shared_Steamworks.Singleton.Client_RequestSteamID);
15.     }
16.  
17.     public static void Server_Register()
18.     {
19.         NetworkServer.RegisterHandler(NetMessage.CHAT_MSG, Chat_Shared.Singleton.Server_ReceiveChatMessage);
20.         NetworkServer.RegisterHandler(NetMessage.PLAYER_INFO, NetworkManagerEx.AddPlayerInfo);
21.     }
22. }
23.  

Code (CSharp):

1. public override void OnStartServer()
2.     {
3.         Chat_Client.Print("Started a server.");
4.         Chat_Client.Print(string.Format("Registering serverside handlers, {0} registered.", NetworkServer.handlers.Count));
5.         Shared_NetHandler.Server_Register();
6.         Chat_Client.Print(string.Format("Done registering serverside handlers, {0} registered.", NetworkServer.handlers.Count));
7.     }
8.  
9.     public override void OnClientConnect(NetworkConnection conn)
10.     {
11.         Chat_Client.Print(string.Format("Registering clientside handlers! C:{0}, S:{1}.", client.handlers.Count, NetworkServer.handlers.Count));
12.         Shared_NetHandler.Client_Register();
13.         Chat_Client.Print(string.Format("Done registering clientside handlers! C:{0}, S:{1}.", client.handlers.Count, NetworkServer.handlers.Count));
14.  
15.         ClientScene.Ready(conn);
16.         Chat_Client.Print("Client is ready");
17.         ClientScene.AddPlayer(0);
18.  
19.         Shared_NetHandler.Server_Register();
20.         Chat_Client.Print(string.Format("Joined a server as client! C:{0}, S:{1}.", client.handlers.Count, NetworkServer.handlers.Count));
21.     }

When I tried logging it, it came up with this in the editor and build.

 

ArgumentException: Value does not fall within the expected range.
Here's the full log - pressed Start Host button and then closed myself.

Shared_NetHandler.cs:51

Code (CSharp):

1. NetworkServer.RegisterHandler(NetMessage.CHAT_MSG, Chat_Shared.Singleton.Server_ReceiveChatMessage);

NetworkManagerEx.cs:31

Code (CSharp):

1. Shared_NetHandler.Server_Register();

Code (CSharp):

1. Mono path[0] = 'C:/Unity 5/2D Cave Game/Build/2/test2_Data/Managed'
2. Mono path[1] = 'C:/Unity 5/2D Cave Game/Build/2/test2_Data/Mono'
3. Mono config path = 'C:/Unity 5/2D Cave Game/Build/2/test2_Data/Mono/etc'
4. PlayerConnection initialized from C:/Unity 5/2D Cave Game/Build/2/test2_Data (debug = 0)
5. PlayerConnection initialized network socket : 0.0.0.0 55320
6. Multi-casting "[IP] 192.168.1.133 [Port] 55320 [Flags] 3 [Guid] 937473506 [EditorId] 636018801 [Version] 1048832 [Id] WindowsPlayer(Flippy) [Debug] 1" to [225.0.0.222:54997]...
7. Waiting for connection from host on [192.168.1.133:55320]...
8. PlayerConnection accepted from [192.168.190.1] handle:0x1c0
9. Using monoOptions --debugger-agent=transport=dt_socket,embedding=1,defer=y,address=0.0.0.0:56506
10. PlayerConnection already initialized - listening to [192.168.1.133:55320]
11. Initialize engine version: 5.1.2p3 (65486b59c7a9)
12. GfxDevice: creating device client; threaded=1
13. Direct3D:
14.     Version:  Direct3D 11.0 [level 11.0]
15.     Renderer: NVIDIA GeForce GTX 760 (ID=0x1187)
16.     Vendor:   NVIDIA
17.     VRAM:     4027 MB
18. Begin MonoManager ReloadAssembly
19. Platform assembly: C:\Unity 5\2D Cave Game\Build\2\test2_Data\Managed\UnityEngine.dll (this message is harmless)
20. Loading C:\Unity 5\2D Cave Game\Build\2\test2_Data\Managed\UnityEngine.dll into Unity Child Domain
21. Platform assembly: C:\Unity 5\2D Cave Game\Build\2\test2_Data\Managed\Assembly-CSharp-firstpass.dll (this message is harmless)
22. Loading C:\Unity 5\2D Cave Game\Build\2\test2_Data\Managed\Assembly-CSharp-firstpass.dll into Unity Child Domain
23. Platform assembly: C:\Unity 5\2D Cave Game\Build\2\test2_Data\Managed\Assembly-CSharp.dll (this message is harmless)
24. Loading C:\Unity 5\2D Cave Game\Build\2\test2_Data\Managed\Assembly-CSharp.dll into Unity Child Domain
25. Platform assembly: C:\Unity 5\2D Cave Game\Build\2\test2_Data\Managed\UnityEngine.UI.dll (this message is harmless)
26. Loading C:\Unity 5\2D Cave Game\Build\2\test2_Data\Managed\UnityEngine.UI.dll into Unity Child Domain
27. Platform assembly: C:\Unity 5\2D Cave Game\Build\2\test2_Data\Managed\UnityEngine.Networking.dll (this message is harmless)
28. Loading C:\Unity 5\2D Cave Game\Build\2\test2_Data\Managed\UnityEngine.Networking.dll into Unity Child Domain
29. Platform assembly: C:\Unity 5\2D Cave Game\Build\2\test2_Data\Managed\UnityEngine.Analytics.dll (this message is harmless)
30. Loading C:\Unity 5\2D Cave Game\Build\2\test2_Data\Managed\UnityEngine.Analytics.dll into Unity Child Domain
31. Platform assembly: C:\Unity 5\2D Cave Game\Build\2\test2_Data\Managed\System.Core.dll (this message is harmless)
32. - Completed reload, in  0.046 seconds
33. desktop: 1920x1200 59Hz; virtual: 3840x1200 at -1920,0
34. <RI> Initializing input.
35.  
36. <RI> Input initialized.
37.  
38. <RI> Initialized touch support.
39.  
40. Platform assembly: C:\Unity 5\2D Cave Game\Build\2\test2_Data\Managed\System.dll (this message is harmless)
41. 0
42. UnityEngine.Debug:Internal_Log(Int32, String, Object)
43. UnityEngine.Debug:Log(Object)
44. NetworkManagerEx:Start() (at C:\Unity 5\2D Cave Game\Assets\Resources\Experimental\NetworkManagerEx.cs:24)
45. (Filename: C:/Unity 5/2D Cave Game/Assets/Resources/Experimental/NetworkManagerEx.cs Line: 24)
46.  
47. ArgumentException: Value does not fall within the expected range.
48.   at Shared_NetHandler.Server_Register () [0x00000] in C:\Unity 5\2D Cave Game\Assets\Resources\Experimental\Shared_NetHandler.cs:51
49.  
50.   at NetworkManagerEx.OnStartServer () [0x00028] in C:\Unity 5\2D Cave Game\Assets\Resources\Experimental\NetworkManagerEx.cs:31
51.  
52.   at UnityEngine.Networking.NetworkManager.StartServer (UnityEngine.Networking.Match.MatchInfo info, UnityEngine.Networking.ConnectionConfig config, Int32 maxConnections) [0x00000] in C:\buildslave\unity\build\Extensions\Networking\Runtime\NetworkManager.cs:218
53.  
54.   at UnityEngine.Networking.NetworkManager.StartServer (UnityEngine.Networking.Match.MatchInfo info) [0x00000] in C:\buildslave\unity\build\Extensions\Networking\Runtime\NetworkManager.cs:213
55.  
56.   at UnityEngine.Networking.NetworkManager.StartServer () [0x00000] in C:\buildslave\unity\build\Extensions\Networking\Runtime\NetworkManager.cs:208
57.  
58.   at UnityEngine.Networking.NetworkManager.StartHost () [0x00006] in C:\buildslave\unity\build\Extensions\Networking\Runtime\NetworkManager.cs:393
59.  
60.   at UnityEngine.Networking.NetworkManagerHUD.OnGUI () [0x00075] in C:\buildslave\unity\build\Extensions\Networking\Runtime\NetworkManagerHUD.cs:67
61. (Filename: C:/Unity 5/2D Cave Game/Assets/Resources/Experimental/Shared_NetHandler.cs Line: 51)
62.  
63. Waiting for finish
64.  

 

Oh, it's not. Turns out that I called it too early before the GameObjects were actually created.