Google urges developers away from Google Cast Preview SDK
Effective March 17, 2014, all whitelisted app IDs using the Google Cast Preview SDK will be disabled. The reason, quite simply, is to help migrate developers over to the official SDK.
We strongly recommended that you not publicly distribute any application using the preview SDK, as the preview SDK would no longer be supported after the official SDK is released (which will cause applications based only on the preview SDK to break).
Although it has been around since the second half of 2013, the Preview SDK was primarily designed for developers to test their apps.
Developers are encouraged to head to the Google Cast Developer Console to manage app IDs for the official SDK as soon as possible.