Generally, that error indicates that Google has changed the YouTube interfaces so the song collector can't find the links to the music stream. That requires an update to the song collector app to adapt to the new interfaces. When you see that, you should check at the top of this thread for a new version:
https://upallnitesoftware.com/forum/index.php?topic=246.0 It generally takes 24-48 hours for me to get the Song collector fixed and a new version posted to that thread. I just verified that the current version on that thread is working and not displaying that error. If you are seeing the error, then I would suggest trying to update.