Youtube Analytics API PHP 无效查询.查询不符合预期

This is the code I'm using:

    $client = new Google_Client();
$key = file_get_contents(storage_path('key.p12'));
$cred = new Google_Auth_AssertionCredentials(
        '***@developer.gserviceaccount.com', array('https://www.googleapis.com/auth/youtube.readonly', 'https://www.googleapis.com/auth/yt-analytics.readonly'), $key);
$client->setAssertionCredentials($cred);
if ($client->getAuth()->isAccessTokenExpired()) {
    $client->getAuth()->refreshTokenWithAssertion($cred);
}

Session::put('service_token', $client->getAccessToken());


  $service = new Google_Service_YouTubeAnalytics($client);
  $id = 'channel==MINE';
  $start_date = '2014-05-01';
  $end_date = '2014-06-30';

  $optparams = array(
  'dimensions' => 'day',
  'sort' => 'day,-views'
  );

  $metric = 'views,estimatedMinutesWatched';

  $api = $service->reports->query($id, $start_date, $end_date, $metric, $optparams);

  $service = new Google_Service_YouTubeAnalytics($client);
  $id = 'channel==MINE';
  $start_date = '2014-05-01';
  $end_date = '2014-06-30';

  $optparams = array(
  'dimensions' => 'day',
  'sort' => 'day,-views'
  );

  $metric = 'views,comments,favoritesAdded,likes,dislikes,estimatedMinutesWatched,averageViewDuration';//'views,estimatedMinutesWatched';

  $api = $service->reports->query($id, $start_date, $end_date, $metric, $optparams);

我的问题是身份验证工作正常，但我无法让分析查询开始工作，我收到以下错误:

Error calling GET https://www.googleapis.com/youtube/analytics/v1/reports?ids=channel%3D%3DMINE&start-date=2014-05-01&end-date=2014-06-30&metrics=views%2CestimatedMinutesWatched&dimensions=day&sort=day%2C-views: (400) Invalid query. Query did not conform to the expectations.