Form Error I "Submit" button> error message pops up

Hello lovely people out there,

I’m trying to figure out why my form isn’t working.
I have already checked a lot of other articles, but I’m still not able to figure out what the problem is.
I would be really grateful if you could give an absolute beginner the solution to solve this problem.

Problem:
After pressing the “Submit” button, an error message pops up.

Thank you very much.

Cheers,
Sebastian

Hey Sebastian, I’ve tested both forms and no errors.
What info are you entering?