Notice: Undefined variable: service in X:\yt\users.php on line 13

Notice: Trying to get property of non-object in X:\yt\users.php on line 5

Fatal error: Uncaught Error: Call to a member function listSubscriptions() on null in X:\yt\users.php:5 Stack trace: #0 X:\yt\users.php(15): subscriptionsListByChannelId(NULL, 'snippet,content...', Array) #1 {main} thrown in X:\yt\users.php on line 5