Error connection | WordPress.org

Did you edit that file?

Try replacing your Divi theme. Download a fresh copy, extract the file functions.php, and replace the one on your server. Use FTP or the file manager app of your hosting control panel to upload the file.

Thanks it’s ok but my back end nostherhappy.be/wp-admin doesn’t work :

Warning: Cannot modify header information – headers already sent by (output started at /home/nostherhqu/www/wp-config.php:1) in /home/nostherhqu/www/wp-includes/pluggable.php on line 1282

Warning: Cannot modify header information – headers already sent by (output started at /home/nostherhqu/www/wp-config.php:1) in /home/nostherhqu/www/wp-includes/pluggable.php on line 1285

Did you replace the theme?

I have only replace functions.php and the website work but the backend no

OK, let’s assume that some other theme file is borked as well.

Replace the entire theme.

if i replace the entire theme, i lose my articles and pages ?

No. Your content is separate from the theme.