Files config is empty

I have made a multiple page form,
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https://www.offirent.be/index.php?option=com_chronoforms6&cont=manager&chronoform=offRent_klant
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When I send the first page I get always this error:
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Files config is empty
It is now just a form without actions. There is no upload file. I have allready read a lot on this forum, but can not find my problem😟
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Thank you,

Deef

Hi Deef,
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What I can see from the front end looks OK. Can you post a form backup so that I can see the other settings?
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Bob