YouTube Data API v3 video upload 403 forbidden: YouTubeSignUpRequired

I am trying to use the new YouTube Data API v3 to upload video to youtube on Android, but I am getting a 403 forbidden error:

com.google.api.client.googleapis.json.GoogleJsonResponseException: 403 Forbidden01-22 00:10:41.716: WARN/System.err(5209): {01-22 00:10:41.716: WARN/System.err(5209): "code" : 403,01-22 00:10:41.716: WARN/System.err(5209): "errors" : [ {01-22 00:10:41.716: WARN/System.err(5209): "domain" : "youtube.header",01-22 00:10:41.716: WARN/System.err(5209): "location" : "Authorization",01-22 00:10:41.716: WARN/System.err(5209): "locationType" : "header",01-22 00:10:41.716: WARN/System.err(5209): "message" : "Forbidden",01-22 00:10:41.716: WARN/System.err(5209): "reason" : "youtubeSignupRequired"01-22 00:10:41.716: WARN/System.err(5209): } ],01-22 00:10:41.720: WARN/System.err(5209): "message" : "Forbidden"01-22 00:10:41.720: WARN/System.err(5209): }

The code is as follow:

I got the OAuth2.0 credential, and I used it to create an instance of youtube:

   YouTube youTube = new YouTube.Builder(new NetHttpTransport(), new JacksonFactory(), credential)                    .setApplicationName("testapp/1.0")                    .build();   # ... creating video to save space ...   youTube.videos().insert("snippet,statistics,status", video, mediaContent).execute();

Any Idea?

Thanks