I have this error when I click "ga door met bestellen"

https://www.kiwanis-zonhoven.be/kerstactie/imlogin.php?landing_page=cart%2Findex.html%3F%23step1&redirect_after_registration=true&cart=true

I can't solve it, so I turned it off again, otherwise orders cannot be placedI can't solve it, so I turned it off again, otherwise orders cannot be placed

My test purchase - Test User from Test City - can be deleted.

I only have a demo shop for testing. Register there as a test buyer and make a test purchase. In my test it worked in the demo shop; emails were also sent to me as the demo shop operator and to test customers.

Data sending to the database is set, see screenshot

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Here my demo shop >> http://finde-links.de/123shop-hosteurope/

ok, i got it working after i installed the latest version.
But where does he keep using vivke@t***.be as a from address? I have checked everything and I have set order@ki***.be everywhere?
orders do arrive in the order mailbox