WordPress warnings when try to login

Hi everyone!

After a DDOS attack I tried to login to my girlfriend’s website, which didn’t worked out because of the many errors and warning messages. I renamed the plugins folder this made a lot of warning disappear, but I’m still not able to login.

Does anyone knows what I can do?

The errors and warnings:

Warning: include_once(/home/customer/www/doubijoux.nl/public_html/wp-content/mu-plugins/.mu-plugin.php): failed to open stream: Permission denied in /home/customer/www/doubijoux.nl/public_html/wp-settings.php on line 349

Warning: include_once(): Failed opening '/home/customer/www/doubijoux.nl/public_html/wp-content/mu-plugins/.mu-plugin.php' for inclusion (include_path='.:/usr/local/php74/pear') in /home/customer/www/doubijoux.nl/public_html/wp-settings.php on line 349

Warning: include_once(/home/customer/www/doubijoux.nl/public_html/wp-content/themes/theme/.theme.php): failed to open stream: Permission denied in /home/customer/www/doubijoux.nl/public_html/wp-content/themes/theme/functions.php on line 4

Warning: include_once(): Failed opening '/home/customer/www/doubijoux.nl/public_html/wp-content/themes/theme/.theme.php' for inclusion (include_path='.:/usr/local/php74/pear') in /home/customer/www/doubijoux.nl/public_html/wp-content/themes/theme/functions.php on line 4

Warning: include_once(/home/customer/www/doubijoux.nl/public_html/wp-content/themes/theme/.theme.php): failed to open stream: Permission denied in /home/customer/www/doubijoux.nl/public_html/wp-content/themes/theme/functions.php on line 8

Warning: include_once(): Failed opening '/home/customer/www/doubijoux.nl/public_html/wp-content/themes/theme/.theme.php' for inclusion (include_path='.:/usr/local/php74/pear') in /home/customer/www/doubijoux.nl/public_html/wp-content/themes/theme/functions.php on line 8

Warning: require_once(/home/customer/www/doubijoux.nl/public_html/wp-content/themes/theme/inc/class-appside.php): failed to open stream: Permission denied in /home/customer/www/doubijoux.nl/public_html/wp-content/themes/theme/functions.php on line 41

Fatal error: require_once(): Failed opening required '/home/customer/www/doubijoux.nl/public_html/wp-content/themes/theme/inc/class-appside.php' (include_path='.:/usr/local/php74/pear') in /home/customer/www/doubijoux.nl/public_html/wp-content/themes/theme/functions.php on line 41

The page I need help with: [log in to see the link]