Thank you for your help!
[root@fedora28 resources]# pwd
/home/ktst/hu3/my-site/resources
[root@fedora28 resources]# ls -lta
total 8
drwxr-xr-x 2 root root 4096 Aug 24 13:57 .
drwxr-xr-x 9 root root 4096 Aug 24 13:57 ..
[root@fedora28 resources]# cd ..
[root@fedora28 my-site]# pwd
/home/ktst/hu3/my-site
[root@fedora28 my-site]# ls -lta ./themes/hugo-fresh/resources/_gen/assets/sass/
total 180
drwxr-xr-x 2 root root 4096 Aug 24 17:38 .
drwxr-xr-x 3 root root 4096 Aug 24 17:38 ..
-rw-r--r-- 1 root root 170698 Aug 24 17:38 style.sass_cf66e63debe6917c04534d6c7b66f623.content
-rw-r--r-- 1 root root 193 Aug 24 17:38 style.sass_cf66e63debe6917c04534d6c7b66f623.json
[root@fedora28 my-site]# pwd
/home/ktst/hu3/my-site
[root@fedora28 my-site]# hugo server
Building sites … ERROR 2018/08/24 17:44:30 error: failed to transform resource: TOCSS: failed to transform "style.sass" (text/x-sass): this feature is not available in your current Hugo version
Total in 19 ms
Error: Error building site: logged 1 error(s)
[root@fedora28 my-site]#