Ruby 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

require 'chilkat'

rest = Chilkat::CkRest.new()

#   Provide a previously obtained OAuth2 access token.
oauth2 = Chilkat::CkOAuth2.new()
oauth2.put_AccessToken("OAUTH2_ACCESS_TOKEN")
rest.SetAuthOAuth2(oauth2)

success = rest.Connect("www.googleapis.com",443,true,true)
if (success != true)
    print rest.lastErrorText() + "\n";
    exit
end

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

sbJson = Chilkat::CkStringBuilder.new()
success = rest.FullRequestNoBodySb("GET","/gmail/v1/users/userId/profile",sbJson)
if (success != true)
    print rest.lastErrorText() + "\n";
    exit
end

if (rest.get_ResponseStatusCode() != 200)
    print "Received error response code: " + rest.get_ResponseStatusCode().to_s() + "\n";
    print "Response body:" + "\n";
    print sbJson.getAsString() + "\n";
    exit
end

json = Chilkat::CkJsonObject.new()
json.LoadSb(sbJson)

#  The following code parses the JSON response.
#  A sample JSON response is shown below the sample code.

errorCode = json.IntOf("error.code")
errorMessage = json.stringOf("error.message")
i = 0
count_i = json.SizeOfArray("error.errors")
while i < count_i
    json.put_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
end

print "Example Completed." + "\n";

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."
 }
}