As the API code is minified, the error you reported is impossible to decipher.
Could you please add the .js.map file to your project, and try again? The browser console should then report a better stack trace.
Thanks.

We just released v1.7.11 of the SFS2X C# client API for Unity / .Net / Mono / Universal Windows Platform.
This new version, together with the previous 1.7.10, fixes a few minor inconsistencies.
You can get it at this url: https://www.smartfoxserver.com/download/sfs2x#p=client

We sent you an email yesterday, did you get it?

Hi. I confirm we have an issue with that UdpAvailable flag, which always returns false. We will fix this in a future API update. Anyway, this doesn't prevent the UDP connection to be established when you call the InitUDP method after a successful login. Are you sure this doesn't work? Do you add the...

I'm sorry, but this is not something we can do. The reason is that the final API js file is generated using Webpack, so we have a very little control over the final output. Additionally, DataStream is a library class we import, but we didn't develop it. What we can do is to send you the source code ...

Hello. We created an empty project in Unity v2018.2.10 with our C# API v1.7.10 to test your exact same code (of course disabling those lines referencing objects we don't have). Everything works as expected both in the Editor and the browser, both in localhost and using the server installed at 37.187...

Sorry, we had to edit your message because pasting the entire API code wasn't helpful.
In any case you are using version 1.7.1, which 1 year and a half old.
We strongly recommend that you download the latest version (1.7.12) and test again.

So, the Extension can't be invoked even if you have the TrisExtension.jar file under the /extensions/Tris folder?
Maybe you deleted it too? This is really weird because my colleague tried again yesterday, and everything works as expected.

I'm not sure why you had to create the "BasicExamples" Zone. It already exists when you install SFS, unless you deleted it. Anyway, the "group id" must be set to the "default" string, and "is game" must be set to false. In fact this is room is the lobby where ...

Sorry, I'm not following you entirely. First of all let me clarify this: we have an examples pack available on your website (and the one you linked is one of the tutorials) and then we have the asset store package. Let's discuss them separately. Examples pack I believe you initially installed SmartF...

That's really weird!
What about the other examples using Extensions? Is everything working fine?
Also, did you try creating the Tris folder manually and just unzip the TrisExtension.jar file to it?

First of all you should check the server log: there's a chance an error occurred for some reason, and you should find it there after the second player joined the same game Room of the first one.
If you find it, can you please report it here? Thanks.

At this url you can get v1.7.8 of the C# API, which doesn't require .NET4 compatibility:
https://www.smartfoxserver.com/download/get/240

We just released v1.7.12 of the SFS2X JavaScript client API. In this release we changed the behavior of putByteArray() / addByteArray() and getByteArray() on both SFSObject and SFSArray. Now the methods accept and return a more appropriate Uint8Array, instead of an array of integer numbers. You can ...

We just released v1.7.9 of the SFS2X C# client API for Unity / .Net / Mono / Universal Windows Platform. What's new: ⋅  Rewritten BlueBox client, using .Net 4.5.x classes. ⋅  Added support for BlueBox (tunneled) connection over HTTPS. ⋅  Added support for proxy settings...