Can't send email. Form data is not in header

This is the first time I setup a contact form in Grav. I use the sample form in

When I submit my form, I am taken to homepage, no email is sent, no errors…

As I’ve debugged in Form plugin, $header->form ( doesn’t exist so onFormProcessed is not triggered and Email plugin is not called. Form content is still in $_POST, but not in Grav’s header.

I really appreciate any suggestions from you to help me find out what causes this problem and fix it.

Problem solved. Don’t know when I added “action: /” to the form. Arrggg!