gmail PHP api - sample code to setvacation in code igniter

I originally used [login to view URL] and added to codeigniter via composer. You can see the getClient function from there. I have the following sample code I made which retrieves Gmail vacation response. As you can see, I update an element of the object to change the subject and attempt to send it back to gmail. It throws an error. What I need is an example of how to set the subject, message, start and end date of the vacation autoresponder. Below is my broken attempt public function setVacation($userToken) { // Get the API client and construct the service object. $client = $this->getClient($userToken); $service = new Google_Service_Gmail($client); // get the vacation settings $user = 'me'; $results = $service->users_settings->getVacation($user); print_r($results); // works to here // ============ // change the subject of the out of office as a test $results->responseSubject = 'Out of Office.'; $results2 = $service->users_settings->updateVacation($user,$vacation); print_r($results2); } This throws the error. A PHP Error was encountered Severity: 4096 Message: Argument 2 passed to Google_Service_Gmail_Resource_UsersSettings::updateVacation() must be an instance of Google_Service_Gmail_VacationSettings, null given, called in .....