无法反序列化异常模型

Question

首先，我可以序列化异常模型：

{
    "data": null,
    "success": false,
    "message": null,
    "exception": {
        "ClassName": "System.DivideByZeroException",
        "Message": "Attempted to divide by zero.",
        "Data": null,
        "InnerException": null,
        "HelpURL": null,
        "StackTraceString": "   at -------.cs:line 63",
        "RemoteStackTraceString": null,
        "RemoteStackIndex": 0,
        "ExceptionMethod": null,
        "HResult": -2147352558,
        "Source": "-----",
        "WatsonBuckets": null
    }
}

但是此模型不反序列化，为什么只有两个模型反序列化？