IL2CPP error in entworking generated code

I have two projects on uNet which have pretty similar code. Maybe about 50% of the code is the same and all features used are the same. One of them builds successfully, when building the other for WebGL using IL2CPP, The IL2CPP compiler gets the following error in the generated code for NetworkWriter classe

---

IL2CPP error for method 'System.Void Unity.GeneratedNetworkCode::_WriteArrayString_None(UnityEngine.Networking.NetworkWriter,System.String[])'
Additional information: Build a development build for more information. An item with the same key has already been added.
il2cpp.exe didn't catch exception: System.ArgumentException: An item with the same key has already been added.
at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
at Unity.IL2CPP.Metadata.VTableBuilder.SetupClassMethods(List`1 slots, TypeDefinition typeDefinition, Dictionary`2 overrideMap)
at Unity.IL2CPP.Metadata.VTableBuilder.VTableForType(TypeDefinition typeDefinition, Dictionary`2 interfaceOffsets, Int32 currentSlot)
---


It seems the method is added twise for some reason, I removed all usages of string[] from RPCs (which was only one actually) but again it got the same error for serializer of one of my classes which are children of MessageBase, The same class works in the other project.

 

Hi
My employer submitted the project and he received this case number in the email , 773323

The exact situation is like this, the code which is generating the error is similar in both projects. When I commented this RPC which had a string[] then another class GameRoom got the same issue, I wrote a serializer for GameRoom instead of relying on the autogenerated one but it didn't fix the issue.

I tried to look for any differences between build settings of the projects but I could not find any. I can not see the generated code so I can not guess why the files are being scanned twise or something like that. but as you can see the thing happening is that some methods in NetworkWriter like WriteGameRoom_none or WriteArrayString_none are being added a second time to the vtable of the NetworkWriter class. Other than this the log doesn't provide any information which I can find useful. Probably by taking a look at generated code you can find out what is wrong with this. I hope since this affects uNet and IL2CPP both, we find a fix not too late.

Many thanks

 

So for the information of others until it gets fixed and spits out better error messages. My problem was that on a NetworkBehaviour I implemented the GetChannel virtual method and also used the [NetworkSettings] attribute both on the script so unity generated the same method again for me and it was causing issues.

 

@JoshPeterson thanks a lot for your help actually. WebGL networking is killing me actually but at least this is fixed now. Since all of my messages which were high frequency were unreliable and in websockets there is no unreliable messages I am getting disconnects even updating 6 times per second

About the above error, I think if you make users capable of examining the generated code it would help in solving similar issues. AutoGenerated code is similar to magic in some ways and when you don't see what is exactly going on, it feels worse however in the uNet case this is the best solution. At least if you put notes in the doc on what assembly we should drop in reflector to see the autogenerated code, it would be good.
Also a chapter on WebGL related problems and how to handle realtime networking there, which connectionConfig parameters and ...