What does this mean:
2019-12-23 22:21:23 WARNING (Thread-2) [homeassistant.components.mqtt] Disconnected from MQTT (1). Trying to reconnect in 128 s2019-12-23 22:32:52 ERROR (MainThread) [frontend.js.latest.201912041] http://192.168.0.97:8123/frontend_latest/app.714f6631.js:58:16116 uncaught exception: YAMLException: unacceptable kind of an object to dump [object Undefined]
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