Understanding YAML Configuration Error messages

[aussie1497]

I updated core and I got this message

how am I supposed to find out on what file this means?

[123 (Taras)]

2026.6: Pick a card, any card

For platform: template repairs and issues with legacy templates, please visit this page

[Didgeridrew]

Removal of legacy template entities in 2026.6

2025.12 - 2026.6 Legacy Template Entity Deprecation Legacy template entities (alarm_control_panel, binary_sensor, cover, fan, light, lock, sensor, switch, vacuum, weather) have been removed in 2026.6. You have to migrate to modern template entity syntax. This change has been in the works for the past 6 months, and you should have received repairs for every legacy template when using versions 2025.12, 2026.1, 2026.2, 2026.3, 2026.4, and 2026.5. If you are still on those versions and you have t…