I restart HA,and i can't open web ui anymore

This is my log:
Feb 13 17:09:07 raspberrypi systemd[1]: Started Home Assistant.
Feb 13 17:09:13 raspberrypi hass[2020]: 2019-02-13 17:09:13 INFO (MainThread) [homeassistant.loader] Loaded sensor from homeassistant.components.sensor
Feb 13 17:09:13 raspberrypi hass[2020]: 2019-02-13 17:09:13 INFO (MainThread) [homeassistant.loader] Loaded group from custom_components.group
Feb 13 17:09:13 raspberrypi hass[2020]: 2019-02-13 17:09:13 WARNING (MainThread) [homeassistant.loader] You are using a custom component for group which has not been tested by Home Assistant. This component might cause stability problems, be sure to disable it if you do experience issues with Home Assistant.
Feb 13 17:09:13 raspberrypi hass[2020]: 2019-02-13 17:09:13 INFO (MainThread) [homeassistant.loader] Loaded websocket_api from homeassistant.components.websocket_api
Feb 13 17:09:13 raspberrypi hass[2020]: 2019-02-13 17:09:13 INFO (MainThread) [homeassistant.bootstrap] Home Assistant core initialized
Feb 13 17:09:13 raspberrypi hass[2020]: 2019-02-13 17:09:13 INFO (MainThread) [homeassistant.loader] Loaded frontend from homeassistant.components.frontend
Feb 13 17:09:13 raspberrypi hass[2020]: 2019-02-13 17:09:13 INFO (MainThread) [homeassistant.loader] Loaded api from homeassistant.components.api
Feb 13 17:09:13 raspberrypi hass[2020]: 2019-02-13 17:09:13 INFO (MainThread) [homeassistant.loader] Loaded http from homeassistant.components.http
Feb 13 17:09:13 raspberrypi hass[2020]: 2019-02-13 17:09:13 INFO (MainThread) [homeassistant.loader] Loaded system_log from homeassistant.components.system_log
Feb 13 17:09:13 raspberrypi hass[2020]: 2019-02-13 17:09:13 INFO (MainThread) [homeassistant.loader] Loaded auth from homeassistant.components.auth
Feb 13 17:09:13 raspberrypi hass[2020]: 2019-02-13 17:09:13 INFO (MainThread) [homeassistant.loader] Loaded onboarding from homeassistant.components.onboarding
Feb 13 17:09:13 raspberrypi hass[2020]: 2019-02-13 17:09:13 INFO (MainThread) [homeassistant.loader] Loaded lovelace from homeassistant.components.lovelace
Feb 13 17:09:13 raspberrypi hass[2020]: 2019-02-13 17:09:13 INFO (MainThread) [homeassistant.loader] Loaded mqtt from homeassistant.components.mqtt
Feb 13 17:09:13 raspberrypi hass[2020]: 2019-02-13 17:09:13 INFO (MainThread) [homeassistant.setup] Setting up mqtt
Feb 13 17:09:13 raspberrypi hass[2020]: 2019-02-13 17:09:13 INFO (MainThread) [homeassistant.setup] Setup of domain mqtt took 0.0 seconds.
Feb 13 17:09:13 raspberrypi hass[2020]: 2019-02-13 17:09:13 INFO (MainThread) [homeassistant.loader] Loaded history from homeassistant.components.history
Feb 13 17:09:13 raspberrypi hass[2020]: 2019-02-13 17:09:13 INFO (MainThread) [homeassistant.loader] Loaded recorder from homeassistant.components.recorder
Feb 13 17:09:13 raspberrypi hass[2020]: 2019-02-13 17:09:13 INFO (MainThread) [homeassistant.setup] Setting up lovelace
Feb 13 17:09:13 raspberrypi hass[2020]: 2019-02-13 17:09:13 INFO (MainThread) [homeassistant.loader] Loaded system_health from homeassistant.components.system_health
Feb 13 17:09:13 raspberrypi hass[2020]: 2019-02-13 17:09:13 INFO (MainThread) [homeassistant.setup] Setup of domain lovelace took 0.0 seconds.
Feb 13 17:09:13 raspberrypi hass[2020]: 2019-02-13 17:09:13 INFO (MainThread) [homeassistant.setup] Setting up http
Feb 13 17:09:13 raspberrypi hass[2020]: 2019-02-13 17:09:13 WARNING (MainThread) [homeassistant.components.http] legacy_api_password support has been enabled. If you don’t require it, remove the ‘api_password’ from your http config.
Feb 13 17:09:13 raspberrypi hass[2020]: 2019-02-13 17:09:13 INFO (MainThread) [homeassistant.setup] Setup of domain http took 0.0 seconds.
Feb 13 17:09:13 raspberrypi hass[2020]: 2019-02-13 17:09:13 INFO (MainThread) [homeassistant.setup] Setting up recorder
Feb 13 17:09:13 raspberrypi hass[2020]: 2019-02-13 17:09:13 INFO (MainThread) [homeassistant.setup] Setting up api
Feb 13 17:09:13 raspberrypi hass[2020]: 2019-02-13 17:09:13 INFO (MainThread) [homeassistant.setup] Setting up websocket_api
Feb 13 17:09:13 raspberrypi hass[2020]: 2019-02-13 17:09:13 INFO (MainThread) [homeassistant.setup] Setup of domain websocket_api took 0.0 seconds.
Feb 13 17:09:13 raspberrypi hass[2020]: 2019-02-13 17:09:13 INFO (MainThread) [homeassistant.setup] Setting up system_log
Feb 13 17:09:13 raspberrypi hass[2020]: 2019-02-13 17:09:13 INFO (MainThread) [homeassistant.setup] Setup of domain system_log took 0.0 seconds.
Feb 13 17:09:13 raspberrypi hass[2020]: 2019-02-13 17:09:13 INFO (MainThread) [homeassistant.setup] Setting up auth
Feb 13 17:09:13 raspberrypi hass[2020]: 2019-02-13 17:09:13 INFO (MainThread) [homeassistant.setup] Setup of domain auth took 0.0 seconds.
Feb 13 17:09:13 raspberrypi hass[2020]: 2019-02-13 17:09:13 INFO (MainThread) [homeassistant.setup] Setting up onboarding
Feb 13 17:09:13 raspberrypi hass[2020]: 2019-02-13 17:09:13 INFO (MainThread) [homeassistant.setup] Setup of domain api took 0.0 seconds.
Feb 13 17:09:13 raspberrypi hass[2020]: 2019-02-13 17:09:13 INFO (MainThread) [homeassistant.setup] Setup of domain onboarding took 0.0 seconds.
Feb 13 17:09:13 raspberrypi hass[2020]: 2019-02-13 17:09:13 INFO (MainThread) [homeassistant.setup] Setting up frontend
Feb 13 17:09:15 raspberrypi hass[2020]: 2019-02-13 17:09:15 INFO (MainThread) [homeassistant.setup] Setup of domain frontend took 2.0 seconds.
Feb 13 17:09:15 raspberrypi hass[2020]: 2019-02-13 17:09:15 WARNING (Recorder) [homeassistant.components.recorder] Ended unfinished session (id=202 from 2019-02-13 09:04:28.651474)
Feb 13 17:09:16 raspberrypi hass[2020]: 2019-02-13 17:09:16 INFO (MainThread) [homeassistant.setup] Setup of domain recorder took 3.5 seconds.
Feb 13 17:09:16 raspberrypi hass[2020]: 2019-02-13 17:09:16 INFO (MainThread) [homeassistant.setup] Setting up history
Feb 13 17:09:16 raspberrypi hass[2020]: 2019-02-13 17:09:16 INFO (MainThread) [homeassistant.setup] Setup of domain history took 0.0 seconds.
Feb 13 17:09:16 raspberrypi hass[2020]: 2019-02-13 17:09:16 INFO (MainThread) [homeassistant.loader] Loaded switch from homeassistant.components.switch
Feb 13 17:09:16 raspberrypi hass[2020]: 2019-02-13 17:09:16 INFO (MainThread) [homeassistant.loader] Loaded switch.wake_on_lan from homeassistant.components.switch.wake_on_lan
Feb 13 17:09:17 raspberrypi hass[2020]: 2019-02-13 17:09:17 INFO (MainThread) [homeassistant.loader] Loaded switch.broadlink from homeassistant.components.switch.broadlink
Feb 13 17:09:17 raspberrypi hass[2020]: 2019-02-13 17:09:17 INFO (MainThread) [homeassistant.loader] Loaded automation from homeassistant.components.automation
Feb 13 17:09:17 raspberrypi hass[2020]: 2019-02-13 17:09:17 INFO (MainThread) [homeassistant.loader] Loaded updater from homeassistant.components.updater
Feb 13 17:09:17 raspberrypi hass[2020]: 2019-02-13 17:09:17 INFO (MainThread) [homeassistant.setup] Setting up updater
Feb 13 17:09:17 raspberrypi hass[2020]: 2019-02-13 17:09:17 INFO (MainThread) [homeassistant.loader] Loaded conversation from homeassistant.components.conversation
Feb 13 17:09:17 raspberrypi hass[2020]: 2019-02-13 17:09:17 INFO (MainThread) [homeassistant.loader] Loaded mqtt.sensor from homeassistant.components.mqtt.sensor
Feb 13 17:09:17 raspberrypi hass[2020]: 2019-02-13 17:09:17 INFO (MainThread) [homeassistant.loader] Loaded sensor.time_date from homeassistant.components.sensor.time_date
Feb 13 17:09:17 raspberrypi hass[2020]: 2019-02-13 17:09:17 INFO (MainThread) [homeassistant.loader] Loaded sensor.template from homeassistant.components.sensor.template
Feb 13 17:09:17 raspberrypi hass[2020]: 2019-02-13 17:09:17 INFO (MainThread) [homeassistant.loader] Loaded sensor.rest from homeassistant.components.sensor.rest
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.setup] Setting up sensor
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.loader] Loaded cloud from homeassistant.components.cloud
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.loader] Loaded map from homeassistant.components.map
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.setup] Setting up map
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.setup] Setup of domain map took 0.0 seconds.
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.loader] Loaded custom_updater from custom_components.custom_updater
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 WARNING (MainThread) [homeassistant.loader] You are using a custom component for custom_updater which has not been tested by Home Assistant. This component might cause stability problems, be sure to disable it if you do experience issues with Home Assistant.
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.setup] Setting up custom_updater
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (Thread-9) [custom_components.custom_updater] if you have ANY issues with this, please report them here: https://github.com/custom-components/custom_updater
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.loader] Loaded script from homeassistant.components.script
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.loader] Loaded shell_command from homeassistant.components.shell_command
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.setup] Setting up shell_command
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.setup] Setup of domain shell_command took 0.0 seconds.
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.loader] Loaded cast from homeassistant.components.cast
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.setup] Setting up cast
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.setup] Setup of domain cast took 0.0 seconds.
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.loader] Loaded tts from homeassistant.components.tts
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.loader] Loaded sun from homeassistant.components.sun
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.setup] Setting up sun
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.setup] Setup of domain sun took 0.1 seconds.
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.loader] Loaded logbook from homeassistant.components.logbook
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.loader] Loaded fan from homeassistant.components.fan
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.loader] Loaded mqtt.fan from homeassistant.components.mqtt.fan
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.setup] Setting up group
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.loader] Loaded ifttt from homeassistant.components.ifttt
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.loader] Loaded webhook from homeassistant.components.webhook
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.loader] Loaded config from homeassistant.components.config
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.loader] Loaded zone from homeassistant.components.zone
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.setup] Setting up zone
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.setup] Setup of domain zone took 0.0 seconds.
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.components.sensor] Setting up sensor.template
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.components.sensor] Setting up sensor.rest
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.components.sensor] Setting up sensor.time_date
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.components.sensor] Setting up sensor.rest
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.components.sensor] Setting up sensor.template
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.setup] Setup of domain updater took 1.3 seconds.
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.loader] Loaded media_player from homeassistant.components.media_player
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.setup] Setting up conversation
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.setup] Setup of domain conversation took 0.0 seconds.
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.setup] Setting up cloud
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.setup] Setup of domain cloud took 0.0 seconds.
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.setup] Setting up tts
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.setup] Setting up logbook
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.setup] Setup of domain logbook took 0.0 seconds.
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.setup] Setting up config
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.components.sensor] Setting up sensor.mqtt
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.components.sensor] Setting up sensor.mqtt
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.loader] Loaded config.area_registry from homeassistant.components.config.area_registry
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.loader] Loaded config.config_entries from homeassistant.components.config.config_entries
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.loader] Loaded config.core from homeassistant.components.config.core
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.loader] Loaded config.auth_provider_homeassistant from homeassistant.components.config.auth_provider_homeassistant
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.loader] Loaded config.auth from homeassistant.components.config.auth
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.loader] Loaded config.customize from homeassistant.components.config.customize
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.loader] Loaded config.device_registry from homeassistant.components.config.device_registry
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.loader] Loaded config.entity_registry from homeassistant.components.config.entity_registry
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.loader] Loaded config.group from homeassistant.components.config.group
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.loader] Loaded config.hassbian from homeassistant.components.config.hassbian
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.loader] Loaded config.automation from homeassistant.components.config.automation
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.loader] Loaded config.script from homeassistant.components.config.script
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.setup] Setting up media_player
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.setup] Setup of domain media_player took 0.0 seconds.
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.setup] Setting up webhook
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.setup] Setup of domain webhook took 0.0 seconds.
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.loader] Loaded media_player.cast from homeassistant.components.media_player.cast
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.setup] Setup of domain tts took 0.2 seconds.
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.setup] Setting up ifttt
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.setup] Setup of domain ifttt took 0.0 seconds.
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.components.media_player] Setting up media_player.cast
Feb 13 17:09:18 raspberrypi hass[2020]: 2019-02-13 17:09:18 INFO (MainThread) [homeassistant.setup] Setup of domain config took 0.2 seconds.
Feb 13 17:09:19 raspberrypi hass[2020]: 2019-02-13 17:09:19 INFO (MainThread) [homeassistant.setup] Setup of domain group took 0.8 seconds.
Feb 13 17:09:19 raspberrypi hass[2020]: 2019-02-13 17:09:19 INFO (MainThread) [homeassistant.setup] Setting up switch
Feb 13 17:09:19 raspberrypi hass[2020]: 2019-02-13 17:09:19 INFO (MainThread) [homeassistant.setup] Setting up automation
Feb 13 17:09:19 raspberrypi hass[2020]: 2019-02-13 17:09:19 INFO (MainThread) [homeassistant.setup] Setting up script
Feb 13 17:09:19 raspberrypi hass[2020]: 2019-02-13 17:09:19 INFO (MainThread) [homeassistant.setup] Setting up fan
Feb 13 17:09:19 raspberrypi hass[2020]: 2019-02-13 17:09:19 INFO (MainThread) [homeassistant.components.switch] Setting up switch.wake_on_lan
Feb 13 17:09:19 raspberrypi hass[2020]: 2019-02-13 17:09:19 INFO (MainThread) [homeassistant.components.switch] Setting up switch.wake_on_lan
Feb 13 17:09:19 raspberrypi hass[2020]: 2019-02-13 17:09:19 INFO (MainThread) [homeassistant.components.switch] Setting up switch.broadlink
Feb 13 17:09:19 raspberrypi hass[2020]: 2019-02-13 17:09:19 INFO (MainThread) [homeassistant.setup] Setup of domain script took 0.1 seconds.
Feb 13 17:09:19 raspberrypi hass[2020]: 2019-02-13 17:09:19 INFO (MainThread) [homeassistant.components.fan] Setting up fan.mqtt
Feb 13 17:09:19 raspberrypi hass[2020]: 2019-02-13 17:09:19 INFO (MainThread) [homeassistant.setup] Setup of domain automation took 0.2 seconds.
Feb 13 17:09:19 raspberrypi hass[2020]: 2019-02-13 17:09:19 INFO (MainThread) [homeassistant.setup] Setup of domain custom_updater took 1.2 seconds.
Feb 13 17:09:19 raspberrypi hass[2020]: 2019-02-13 17:09:19 INFO (Thread-2) [pychromecast] Querying device status
Feb 13 17:09:19 raspberrypi hass[2020]: 2019-02-13 17:09:19 INFO (MainThread) [homeassistant.setup] Setup of domain fan took 0.2 seconds.
Feb 13 17:09:19 raspberrypi hass[2020]: 2019-02-13 17:09:19 ERROR (Thread-2) [pychromecast.socket_client] Failed to connect, retrying in 5.0s
Feb 13 17:09:19 raspberrypi hass[2020]: 2019-02-13 17:09:19 INFO (MainThread) [homeassistant.setup] Setup of domain sensor took 1.7 seconds.
Feb 13 17:09:21 raspberrypi hass[2020]: 2019-02-13 17:09:21 INFO (MainThread) [homeassistant.setup] Setup of domain switch took 2.3 seconds.

Could someone give me a little help please?
Thank you,
Kanson

I’ve got the same troubles, but not even after a restart. It functioned well for around a day and suddenly stopped working.

Removing system_health from the configuration.yaml did the job for me and now I can use the UI again…

Thank you for your reply,but i did not load system_health component in configuration.yaml

The problem is solved, the problem is related to my network.