Hi,
Thank you for creating a new thread, is logging in to the admin dashboard is part of the issue? I still can’t login to your admin dashboard it always says “FEHLER: Falscher Nutzername oder Passwort.”
Would you mind switching to parent X theme?
I’m still on site files via FTP.
Update: No, dice I was not able to trace the issue, the error reporting is pointing to your child theme’s functions.php file, but I even try to remove all your custom functions in there but the error is still happening. Besides functions.php, is there any php files that you edited? All resources are pointing to Blank lines either at the top or bottom of the file or too many spaces in between <?php and ending ?>
Please recall what other files that you edit and what plugin did you install recently.
I was able to hide the warning by adding define('WP_DEBUG_DISPLAY', false ); on the wp-config.php file (but that does not mean the error is resolve.) it is still showing on the debug.log.
If you can not do a plugin test and switch to parent theme on the live site, please duplicate your site to a staging server so we can test it.
Thanks,