I am trying to put this website back online. The error message is the following :
Fatal error: Uncaught Error: Call to undefined function get_header() in /homepages/25/d584099293/htdocs/clickandbuilds/X3DSYSTEMS/wp-content/themes/x3dprotheme/index.php:4 Stack trace: #0 {main} thrown in /homepages/25/d584099293/htdocs/clickandbuilds/X3DSYSTEMS/wp-content/themes/x3dprotheme/index.php on line 4
The client told me he "accidentaly reseted the domain". First when I went on the website I had an error message about Wordfence and I did what I needed to do to correct it (here what I did : https://docs.wordfence.com/en/After_moving_a_site_or_deleting_some_files%2C_I_see__PHP_Fatal_error__Unknown__Failed_opening_required_/var/www/html/wordfence-waf.html ) I removed the firewall setup manually.
Then I got this new message of error about index.php
In this index.php, here what I found :
<?php get_header(); ?>
<?php get_footer(); ?>
I try to get this website back online. Thanks for your help.