Can't delete file in File Manager

NOTE: In chmod i already set all permissions to 777
Chmod also the subdirectories within this directory - checked!
Chmod also the files within this directory - checked also!

but still …

Unable to delete the subdirectory /

hope can get help here, thanks

You can’t remove the directories of old domains. The log files in that directory are not owned by your user which is why you cannot delete them. That’s intentional, we don’t want people to tamper with the logs.