Universal Media Player - Mute button not working, error thrown

Configuration
1

Hi there!
I’m trying to configure the mute button of the Universal Media Player component, without success. Volume up and volume down are working fine. This is the error that I get:

2017-08-17 14:10:00 ERROR (MainThread) [homeassistant.core] Error doing job: Task exception was never retrieved
Traceback (most recent call last):
File “/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/asyncio/tasks.py”, line 239, in _step
result = coro.send(None)
File “/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/homeassistant/core.py”, line 1025, in _event_to_service_call
yield from service_handler.func(service_call)
File “/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/homeassistant/components/media_player/init.py”, line 409, in async_service_handler
yield from getattr(player, method[‘method’])(**params)
TypeError: async_mute_volume() got an unexpected keyword argument ‘mute’

This is my configuration (running HA 0.50.2):

media_player:
  platform: universal
  name: Telecomando studio
  children:
    - media_player.studio
    - media_player.studio_2
  commands:
    turn_on:
      service: script.turn_on
      data:
        entity_id: script.studio_accendi
    turn_off:
      service: script.turn_on
      data:
        entity_id: script.studio_spegni
    volume_up:
      service: switch.turn_on
      data:
        entity_id: switch.studio_amplificatore_vol
    volume_down:
      service: switch.turn_off
      data:
        entity_id: switch.studio_amplificatore_vol
    volume_mute:
      service: switch.turn_on
      data:
        entity_id: switch.studio_amplificatore_vol_muto
  attributes:
    state: switch.studio_amplificatore
    is_volume_muted: switch.studio_amplificatore_vol_muto

And this is the code for the studio_amplificatore_vol_muto switch (is the same code for on and off, I even tried without the off row with no help):

    studio_amplificatore_vol_muto:
      friendly_name: "studio_amplificatore_vol_muto"
      command_on: 'JgBgAAABKZIUERM2ExEUERQ1FBETNxM2EzUUERQ1FDUUERM2EzcTERQ1FBEUNRQRExEUERQRExEUERQ2ExITNhM2EzYTNhM2EwAFAgABKEgTAAxOAAEnSRMADE0AAShIFAANBQAAAAAAAAAA'
      command_off: 'JgBgAAABKZIUERM2ExEUERQ1FBETNxM2EzUUERQ1FDUUERM2EzcTERQ1FBEUNRQRExEUERQRExEUERQ2ExITNhM2EzYTNhM2EwAFAgABKEgTAAxOAAEnSRMADE0AAShIFAANBQAAAAAAAAAA'

Any thoughts? :slight_smile: