multicast udpsink fails

[JPM]

Hi,

I am trying to send one audio stream to several clients using multicast
with this pipeline :

gst-launch-1.0 -v audiotestsrc ! audioconvert ! audioresample !
audio/x-raw,format=S16LE,channels=1,rate=44100 ! udpsink host=224.1.1.1
auto-multicast=true port=3000

But appear the following error :

Setting pipeline to PAUSED ...
ERROR: Pipeline doesn't want to pause.
ERROR: from element /GstPipeline:pipeline0/GstUDPSink:udpsink0: Could not
get/set settings from/on resource.
Additional debug info:
gstmultiudpsink.c(844): gst_multiudpsink_configure_client ():
/GstPipeline:pipeline0/GstUDPSink:udpsink0:
Could not join multicast group: Error joining multicast group: No such
device
Setting pipeline to NULL ...
Freeing pipeline ...

Any help ?

Thanks and regards.
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