GStreamer warning: gst-stream-error-quark: No volume control found

I’ve only just moved over to Mopidy, having relied on PiMusicbox until now.
Is the warning below anything to worry about, everything seems to work ok as is.

’ GStreamer warning: gst-stream-error-quark: No volume control found ’

I get this too, afaik nothing to worry about

Thank you - I was hoping that was the case.