Your reCAPTCHA response was incorrect.

I would like to add that my ‘old’ form still works with reCAPTCHA (the recent version without typing characters).
I don’t know how, but the new added reCAPTCHA doesn’t work at all.
It is impossible to send my newly made form.

A suggestion for using reCAPTCHA.
Can you also make the old reCAPTCHA available for the custom contact form?
The new reCAPTCHA works with pictures, but it also translates the text (in my case) into Dutch.
However my international visitors don’t understand Dutch. So if they are asked to pick out the pictures with ‘kaas’ (meaning cheese), they probably don’t know what to do. The oldfashioned characters did work.
I would be happy to be able to make a choice between old reCAPTCHA and the new one.