External Email - Use Caution
Hello Gizem,
Are you by any chance running Ubuntu Linux through WSL or a VM on a Windows machine - AND/OR - trying to write your data from Ubuntu linux to a mounted NTFS file system on a Windows machine? The Windows file system does not support symbolic links and so you need to set SUBJECTS_DIR to point to path on a Linux file system. I am not aware of linux OS file systems that do not support symbolic links.