Contact Form not Working

I have tried all that i see on the documentation and nothing is working. I contacted my hosting company and the told me the email sending functions are ok. I can receive my password reset email. I added this: function change_cf_from() {
return ” (Email address hidden if logged out) “;
}
add_filter(‘avf_form_from’, ‘change_cf_from’, 10);

to the functions.php but still same result.