Try saving it as a playlist and then playing the playlist.
Play the stream.
In Playing Now, right click and save it.
No, this doesn't work I'm afraid, I get the same error.
1. On the server, started playback of the radio channel.
2. Went to Playing Now, right-clicked on the radio channel in the list and created a new playlist.
3. Verified that the new playlist exists and contained that one item.
4. On the client, reloaded MC.
5. Went to Playlists (in Theater View), long-pressed on the playlist icon (on a tablet - same as right-click) without drilling down into the playlist and selected Play from the pop-up menu.
6. The cover art of the channel is displayed together with a message "Opening..." at the bottom.
7. After about 10 seconds, the error message is displayed.