Custom element doesn't exist: mishroom

Hi all, i have some probleme with the custom card.

When my device (iphone) is in local connexion, everything is fine.

When i try external connection, this message appear:

If its native element its ok.

I read some topic to know but i dont know by why i can start to search.

Someone can help me?

Thx

Try flushing the browser cache, and or app cache.

Nothing happen its the same :neutral_face:

Everything is good.
I clear several time the cash and restart HA.

Thx for the help