Error: 0 Invalid address: (to):

debbing 11h ago

I have a new website with Joomla5 and chronoforms8. I wrote a form, (copied demo and changed).

The demo works. the form is shown correctly (in article). But by submit I get the errorcode, the data are not saved, the mails not send. what can I do? 

this is the url: https://cvjmmainz.de/fuer-kinder/abenteuertage

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