Is it possible to save chat history in Json format, for later upload history from file?

[AzerQ]

Hi, recently saw your library, it fits my needs perfectly. I am using the original Nuget package, I am now loading and saving data with the following code:

        public static Conversation LoadChatMessagesFromFile(Conversation chat, string path)
        {
            string inputJson = File.ReadAllText(path);
            var messages = JsonConvert.DeserializeObject<IList<ChatMessage>>(inputJson);
            chat.Messages.Clear();
            foreach (var chatMessage in messages)
            {
                chat.Messages.Add(chatMessage);
            }
            return chat;
        }

        public static void SaveChatMessagesToFile(Conversation chat, string path)
        {
            string jsonData = JsonConvert.SerializeObject(chat.Messages, Formatting.Indented);
            File.WriteAllText(path, jsonData);
        }

Serialization is done using Newtonsoft.Json:

[
  {
    "role": "user",
    "content": [
      {
        "type": "text",
        "text": "Hi, whats up?",
        "image_url": null
      }
    ],
    "name": null
  },
  {
    "role": "assistant",
    "content": [
      {
        "type": "text",
        "text": "Hello! I'm just here to help with any questions or tasks you may have. How can I assist you today?",
        "image_url": null
      }
    ],
    "name": null
  },
  {
    "role": "user",
    "content": [
      {
        "type": "text",
        "text": "Talk about yourself",
        "image_url": null
      }
    ],
    "name": null
  },
  {
    "role": "assistant",
    "content": [
      {
        "type": "text",
        "text": "I am a language model AI designed to assist with a wide range of tasks and provide information on various topics. I am constantly learning and improving to better serve users like you. Is there anything specific you would like to know or discuss?",
        "image_url": null
      }
    ],
    "name": null
  }
]

But an exception is thrown when loading in runtime: line:

var messages = JsonConvert.DeserializeObject<IList<ChatMessage>>(inputJson);

exception: Newtonsoft.Json.JsonSerializationException: "Error setting value to 'ContentItems' on 'OpenAI_API.Chat.ChatMessage'." innerException: NullReferenceException: Object reference not set to an instance of an object. Any advice on how this can be fixed?

[riiight]

Just wanted to say that I am also experiencing this. I didn't have problems serializing using an old version of the library. Just started happening when I upgraded today.