Frontend with custom cards not visible anymore

Suddenly the frontend in all my devices shows this:

And this is what i see in all the dashboards and views on Chrome and Edge browsers and on mobile app regarding ALL the custom cards…
What happened?
I cleared the cache many times but unsuccesfully…

Did you try reloading/reinstalling the custom cards via HACS?

If nothing works, go to your backup file and restore the Lovelace content only…

Restart Home Assistant

Yes, that was the issue… suddenly HA notified me HACS must reload all the custom cards… Very strange…