Well the first problem was solved, but I face a new one:
Type 'CuteChat.LobbyInfo' in Assembly 'CuteChat, Version=5.0.0.0, Culture=neutral, PublicKeyToken=da0fc3a24b6f18ba' is not marked as serializable.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.