Notify availability 1.4.2 Saving Error

Notify availability 1.4.2 Saving Error

since a short time after pressing the send button we have received the following error message:
Error while saving
However, the customer name and mail is saved and is also visible in the backend
but this error message puzzles all customers?

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Aw: Notify availability 1.4.2 Saving Error

My test shop works fine.
Url?
ftp access?
(forum privat msg.)

Aw: Notify availability 1.4.2 Saving Error

https://www.weinshop24.cc/online-shop/prosecco-sekt-spumante/prosecco-spumante-brut-docg-bepin-de-eto

Aw: Notify availability 1.4.2 Saving Error

ftp access?
(forum privat msg.)