Deserializing json C# unexpected character encountered

Not sure where I’m going wrong here. Serialized an object with newtonsoft to post to a web api. Running into error: "unexpected character encountered"

Here’s my json:

{
"Eve": "wizz",
"familyid": "1006949",
"time": "07/21 05:45:59 AM",
"DogName": "Rocky",
"userid": "1006949"
}

Deserialize:

BtnData listObj = Newtonsoft.Json.JsonConvert.DeserializeObject<BtnData>(json.ToString());

Model:

   public class BtnData
    {

        [JsonProperty("Eve")]
        public string Eve { get; set; }
        [JsonProperty("Familyid")]
        public string Familyid { get; set; }
        [JsonProperty("Time")]
        public string Time { get; set; }
        [JsonProperty("DogName")]
        public string DogName { get; set; }
        [JsonProperty("Userid")]
        public string Userid { get; set; }
    }

controller:

public ActionResult AddEvent([FromBody] BtnData json)