Gajim gives error message when trying to make a voice call

Versions:

• OS: Trisquel GNU/Linux Aramo (11.0.1) 11.0.1 (aramo)
• GTK Version: 3.24.33
• PyGObject Version: 3.42.1
• GLib Version : 2.71.3
• python-nbxmpp Version: 3.2.3
• Gajim Version: 1.4.7

Traceback

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/gajim/gtk/controls/chat.py", line 449, in _on_start_voice_call
    app.call_manager.start_call(self.account, self.jid, CallType.AUDIO)
  File "/usr/lib/python3/dist-packages/gajim/common/call_manager.py", line 314, in start_call
    sid = client.get_module('Jingle').start_audio(
  File "/usr/lib/python3/dist-packages/gajim/common/modules/jingle.py", line 185, in start_audio
    jingle.add_content('voice', JingleAudio(jingle))
  File "/usr/lib/python3/dist-packages/gajim/common/jingle_rtp.py", line 387, in __init__
    self.setup_stream()
  File "/usr/lib/python3/dist-packages/gajim/common/jingle_rtp.py", line 402, in setup_stream
    JingleRTPContent.setup_stream(self, self._on_src_pad_added)
  File "/usr/lib/python3/dist-packages/gajim/common/jingle_rtp.py", line 138, in setup_stream
    self.p2pstream.set_transmitter_ht('nice', params)
gi.repository.GLib.GError: fs-error: Could not create the nicesrc element (1)

Steps to reproduce the problem

Open Gajim and try to start a voice call...