It is not the abvfp.php that cannot be found. The script is loaded, and it works. It even sent me the autoresponder message when i tested it. But, after submission, looks for your thankyou page (which you have called "action.html" and no such page exists on your site, that's why you get this message.

The checkbox, as well as the combobox, become required as all the others: by setting the extension -R in their name. I would suggest -RA or -RB for security reasons.

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