Contact form not working in WP. It gives an AJAX error, what should I do?

Question

AJAX

I'm a current beginner programmer, so I'm sorry if it's inconvenient to give codes. The essence of the question is this: I made feedback on my site and decided to check it out. Well, I entered the mail, etc., and when sending the application, it throws me to the page " himark.kz/wp-admin/admin-ajax.php#wpcf7-f87-o1 " and displays the number zero on the screen. What is the problem? I looked in the internet, they write that AJAX, but I'm weakly fumbling.