Cover - shellyswitch many warnings

I get a lot of warnings when I use shellyswitch2 as cover:

- platform: mqtt
  name: "Rollladen Kueche"
  state_topic: "shellies/shellyswitch-5B2446/roller/0"            # Returns open,close while in motion, stop when not moving
  command_topic: "shellies/shellyswitch-5B2446/roller/0/command"  # Accepts open, close, stop
  payload_open: "open"
  payload_close: "close"
  payload_stop: "stop"
  state_open: "open"
  state_closed: "close"
  retain: true
  optimistic: false
  qos: 0

WARNINGS

  2018-11-28 18:07:57 WARNING (MainThread) [homeassistant.components.cover.mqtt] Payload is not True or False: stop
  2018-11-28 18:07:57 WARNING (MainThread) [homeassistant.components.cover.mqtt] Payload is not True or False: stop
  2018-11-28 18:07:58 WARNING (MainThread) [homeassistant.components.cover.mqtt] Payload is not True or False: stop
  2018-11-28 18:08:00 WARNING (MainThread) [homeassistant.components.cover.mqtt] Payload is not True or False: stop
  2018-11-28 18:08:02 WARNING (MainThread) [homeassistant.components.cover.mqtt] Payload is not True or False: stop
  2018-11-28 18:08:04 WARNING (MainThread) [homeassistant.components.cover.mqtt] Payload is not True or False: stop
  2018-11-28 18:08:12 WARNING (MainThread) [homeassistant.components.cover.mqtt] Payload is not True or False: stop
  2018-11-28 18:08:13 WARNING (MainThread) [homeassistant.components.cover.mqtt] Payload is not True or False: stop
  2018-11-28 18:08:15 WARNING (MainThread) [homeassistant.components.cover.mqtt] Payload is not True or False: stop
  2018-11-28 18:08:17 WARNING (MainThread) [homeassistant.components.cover.mqtt] Payload is not True or False: stop
  2018-11-28 18:08:19 WARNING (MainThread) [homeassistant.components.cover.mqtt] Payload is not True or False: stop
  2018-11-28 18:08:21 WARNING (MainThread) [homeassistant.components.cover.mqtt] Payload is not True or False: stop
  2018-11-28 18:08:23 WARNING (MainThread) [homeassistant.components.cover.mqtt] Payload is not True or False: stop
  2018-11-28 18:08:25 WARNING (MainThread) [homeassistant.components.cover.mqtt] Payload is not True or False: stop
  ....

What am I doing wrong or how can I suppress these many messages?

Hi,
Did you verifiy that you put your config in the cover: section?
Sounds like it’s in the wrong section ?

Hi,
Thx for the replay. All config for covers are already in the cover:section.
I can switch cover up, down and stop. All works fine, the warnings will fill up the log.