Reproduction:
<telerik:RadMediaPlayer RenderMode="Lightweight" ID="RadMediaPlayer1" runat="server" AutoPlay="true"
Height="360px" Width="640px">
<PlaylistSettings YouTubePlaylist="PL28149B23F489D223" Mode="Buttons" ButtonsTrigger="MouseDown" />
</telerik:RadMediaPlayer>
Using the 2015 Q2 version, there will be no error when the playlist is invalid. The RadMediaPlayer playlist will remain empty, and you can handle the PreRender event if you want to do further configurations
Hi guys, Please, give your vote, if you want to see support for subtitles in RadMediaPlayer. Best regards, Rumen