ArgumentException: JSON parse error: The document root must not follow by other values.

[Zeon8]

I paste code from wiki https://github.com/nhn/socket.io-client-unity3d/wiki/Sample#2-acks-message and run nodejs server and run unity client and in log this error:
ArgumentException: JSON parse error: The document root must not follow by other values.
UnityEngine.JsonUtility.FromJson (System.String json, System.Type type) (at C:/buildslave/unity/build/Modules/JSONSerialize/Public/JsonUtility.bindings.cs:50)
UnityEngine.JsonUtility.FromJson[T] (System.String json) (at C:/buildslave/unity/build/Modules/JSONSerialize/Public/JsonUtility.bindings.cs:33)
socket.io.SocketInitializer+d__21.MoveNext () (at Assets/Plugins/socket.io/SocketInitializer.cs:138)
UnityEngine.SetupCoroutine.InvokeMoveNext (System.Collections.IEnumerator enumerator, System.IntPtr returnValueAddress) (at C:/buildslave/unity/build/Runtime/Export/Coroutines.cs:17

My Laptop:
Intel Pentium 2020m
4 GB RAM
Intel® HD Graphics for 3rd Generation Intel® Processors

[sandichhuu]

Hi, i'm also face this error.
Here is my way to fix this:

[iglikoxha]

You should use an older version of socket.io specifically 1.7.4 the latest 1.x version