Can't run example from Colyseus Unity SDK, got JsonSerializationException

Hi, there's an issue, need guys to help!

platform: WebGL
There has no exception when running in Unity Editor, but has an exception in the browser.

When the client joins the room, the exception shows up:

JsonSerializationException: Unable to deserialize instance of 'Colyseus.Schema.MapSchema`1[[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]]' because there is no parameterless constructor is defined on type.
  at GameDevWare.Serialization.Metadata.TypeDescription.CreateInstance () [0x00000] in <00000000000000000000000000000000>:0 
Rethrow as SerializationException: Failed to read value for member 'attributes' of 'ExampleNetworkedUser' type.
More detailed information in inner exception.
  at GameDevWare.Serialization.Serializers.ObjectSerializer.DeserializeMembers (GameDevWare.Serialization.IJsonReader reader, GameDevWare.Serialization.IndexedDictionary`2[KeyT,ValueT] container, GameDevWare.Serialization.Serializers.ObjectSerializer& serializerOverride) [0x00000] in <00000000000000000000000000000000>:0 
--- End of stack trace from previous location where exception was thrown ---
  at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <00000000000000000000000000000000>:0

Hi!
The Unity SDK updates frequently lately.

  1. download the sdk: https://github.com/colyseus/colyseus-unity-sdk/releases/tag/0.14.18
  2. download the example: https://github.com/colyseus/colyseus-unity-sdk/tree/master/Assets/Colyseus/Runtime/Example~
  3. copy Example~ folder to unity and remove the "~"
  4. build and run to see if all right.
    0_1659527347045_22233cc6-15c7-4b65-8bf1-0b8d856b0176-image.png
    Good luck!