Problem after Updating in Lovelace

Configuration
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Hello after updating to 0.81.0.dev0,
i get following error in my LovelaceUI:

          #  color_type: blank-card
      - id: 642aec22cdbf46b7bd512a26ad736afd  # Automatically created id
        type: vertical-stack
        cards:
          - type: custom:weather-card
            entity_weather: weather.yweather
            entity_sun: sun.sun
          - type: iframe
            url: https://embed.windy.com/embed2.html?lat=49.139&lon=12.393&zoom=6&level=surface&overlay=rain&menu=&message=true&marker=&calendar=&pressure=&type=map&location=coordinates&detail=&detailLat=49.050&detailLon=12.101&metricWind=km%2Fh&metricTemp=%C2%B0C&radarRange=-1

what did i do wrong, it was perfect before the update, i think?
I use more vertical stacks in my build and any other is running smoothly,
thx in Advance
Wiesl

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