I experienced the same error in my Xamarin.Android solution.
I verified that my JSON was correct, and noticed that the error only appeared when I ran the app as a Release build.
It turned out that the Linker was removing a library from Newtonsoft.JSON, causing the JSON to be parsed incorrectly.
I fixed the error by adding Newtonsoft.Json to the Ignore assemblies setting in the Android Build Configuration (screen shot below)
JSON Parsing Code
static readonly JsonSerializer _serializer = new JsonSerializer();
static readonly HttpClient _client = new HttpClient();
static async Task<T> GetDataObjectFromAPI<T>(string apiUrl)
{
using (var stream = await _client.GetStreamAsync(apiUrl).ConfigureAwait(false))
using (var reader = new StreamReader(stream))
using (var json = new JsonTextReader(reader))
{
if (json == null)
return default(T);
return _serializer.Deserialize<T>(json);
}
}
Visual Studio Mac Screenshot
Visual Studio Screenshot