Error message in HA-log file

Hi All,
When I start my HA on my rasp3B I get the message below 3 times. HA starts and reboots really slow. Any ideas about the cause of this error message? Maybe this is also the reason for responding this slow?
Thx
PPee

2019-01-25 10:05:48 ERROR (MainThread) [homeassistant.components.sensor] upnp: Error on device update!
Traceback (most recent call last):
File “/usr/local/lib/python3.6/site-packages/homeassistant/helpers/entity_platform.py”, line 248, in _async_add_entity
await entity.async_device_update(warning=False)
File “/usr/local/lib/python3.6/site-packages/homeassistant/helpers/entity.py”, line 347, in async_device_update
await self.async_update()
File “/usr/local/lib/python3.6/site-packages/homeassistant/components/sensor/upnp.py”, line 220, in async_update
new_value = await self._async_fetch_value()
File “/usr/local/lib/python3.6/site-packages/homeassistant/components/sensor/upnp.py”, line 252, in _async_fetch_value
return await self._device.async_get_total_bytes_sent()
File “/usr/local/lib/python3.6/site-packages/homeassistant/components/upnp/device.py”, line 145, in async_get_total_bytes_sent
return await self._igd_device.async_get_total_bytes_sent()
File “/usr/local/lib/python3.6/site-packages/async_upnp_client/igd.py”, line 91, in async_get_total_bytes_sent
result = await action.async_call()
File “/usr/local/lib/python3.6/site-packages/async_upnp_client/init.py”, line 626, in async_call
(status_code, response_body))
async_upnp_client.UpnpError: Error during async_call(), status: 500, body: <?xml version="1.0" encoding="utf-8"?>
<s:Envelope xmlns:s=“http://schemas.xmlsoap.org/soap/envelope/” s:encodingStyle=“http://schemas.xmlsoap.org/soap/encoding/”>
<s:Body>
<s:Fault>
s:Client
UPnPError


800
do not execute action(all)


</s:Fault>
</s:Body>
</s:Envelope>