C# UWP/WinRT GMail: Parse GMail REST API Error Response

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Gets the current user's Gmail profile, but shows an error response and how to parse it..

Documentation: https://developers.google.com/gmail/api/v1/reference/users/getProfile

Chilkat.Rest rest = new Chilkat.Rest();
bool success;

//   Provide a previously obtained OAuth2 access token.
Chilkat.OAuth2 oauth2 = new Chilkat.OAuth2();
oauth2.AccessToken = "OAUTH2_ACCESS_TOKEN";
rest.SetAuthOAuth2(oauth2);

success = await rest.ConnectAsync("www.googleapis.com",443,true,true);
if (success != true) {
    Debug.WriteLine(rest.LastErrorText);
    return;
}

rest.AddPathParam("userId","matt@chilkat.io");

Chilkat.StringBuilder sbJson = new Chilkat.StringBuilder();
success = await rest.FullRequestNoBodySbAsync("GET","/gmail/v1/users/userId/profile",sbJson);
if (success != true) {
    Debug.WriteLine(rest.LastErrorText);
    return;
}

if (rest.ResponseStatusCode != 200) {
    Debug.WriteLine("Received error response code: " + Convert.ToString(rest.ResponseStatusCode));
    Debug.WriteLine("Response body:");
    Debug.WriteLine(sbJson.GetAsString());
    return;
}

Chilkat.JsonObject json = new Chilkat.JsonObject();
json.LoadSb(sbJson);

//  The following code parses the JSON response.
//  A sample JSON response is shown below the sample code.
int errorCode;
string errorMessage;
int i;
int count_i;
string domain;
string reason;
string message;
string extendedHelp;

errorCode = json.IntOf("error.code");
errorMessage = json.StringOf("error.message");
i = 0;
count_i = json.SizeOfArray("error.errors");
while (i < count_i) {
    json.I = i;
    domain = json.StringOf("error.errors[i].domain");
    reason = json.StringOf("error.errors[i].reason");
    message = json.StringOf("error.errors[i].message");
    extendedHelp = json.StringOf("error.errors[i].extendedHelp");
    i = i + 1;
}

Debug.WriteLine("Example Completed.");

Sample JSON Response Body

{
 "error": {
  "errors": [
   {
    "domain": "usageLimits",
    "reason": "accessNotConfigured",
    "message": "Access Not Configured. Gmail API has not been used in project 377697329735 before or it is disabled. Enable it by visiting https://console.developers.google.com/apis/api/gmail.googleapis.com/overview?project=377697329735 then retry. If you enabled this API recently, wait a few minutes for the action to propagate to our systems and retry.",
    "extendedHelp": "https://console.developers.google.com/apis/api/gmail.googleapis.com/overview?project=377697329735"
   }
  ],
  "code": 403,
  "message": "Access Not Configured. Gmail API has not been used in project 377697329735 before or it is disabled. Enable it by visiting https://console.developers.google.com/apis/api/gmail.googleapis.com/overview?project=377697329735 then retry. If you enabled this API recently, wait a few minutes for the action to propagate to our systems and retry."
 }
}