Hi, I am running Home assistant under hass.io in a VM.
After upgrading from 0.102.3 to 0.103.2, I am unable to access the GUI, seeing only ‘Loading Data’.
I see several of the following entries in home-assistant.log:
2019-12-19 23:12:23 ERROR (MainThread) [homeassistant.core] Error doing job: Task exception was never retrieved Traceback (most recent call last): File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 275, in async_update_ha_state f"No entity id specified for entity {self.name}"
Other log errors are:
2019-12-19 23:34:38 ERROR (MainThread) [homeassistant.helpers.service] Error rendering data template: UndefinedError: 'None' has no attribute 'state'
2019-12-19 23:35:08 ERROR (MainThread) [homeassistant.components.websocket_api.http.connection.139986965022608] Unable to serialize to JSON: Object of type date is not JSON serializable
I am stuck trying to figure out what to do next to troubleshoot the problem. Any suggestions appreciated.