I am trying to use this link to get a playlist item,http://developers.google.com/youtube/v3/docs/playlistItems/list
At the bottom of the page there is a try-it interface, I entered "contentDetails" or "snippet" in the "part", "PL4BF5198F14EEC8A5" in the "ID" field and clicked "execute". But the result does not have an element.
If I use this link on youtube, I can get a playlist.http://www.youtube.com/playlist?list=PL4BF5198F14EEC8A5
So, I want to ask if I filled out something wrong in the try-it table.
Make sure you put the playlist identifier in the "playlistId" field further down the page and NOT the first "id" field.
You need to be authorized for this call, have you clicked the "Authorize requests using OAuth 2.0" button to allow the page to receive this list on your behalf (using oAuth2)?