Newtonsoft.Json.JsonSerializationException for API [duplicate]

I keep getting an error after running the code for a few minutes

Newtonsoft.Json.JsonSerializationException: 'Cannot deserialize the current JSON object (e.g. {"name":"value"}) into type 'System.Collections.Generic.List`1[BitMEX.Order]' because the type requires a JSON array (e.g. [1,2,3]) to deserialize correctly. To fix this error either change the JSON to a JSON array (e.g. [1,2,3])

Can you please help me?

public List<Position> GetOpenPositions(string symbol)
{
    var param = new Dictionary<string, string>();

    string res = Query("GET", "/position", param, true);

    return JsonConvert.DeserializeObject<List<Position>>(res)
        .Where(a => a.Symbol == symbol && a.IsOpen == true)
        .OrderByDescending(a => a.TimeStamp)
        .ToList();
}