Configuration variable not found: PRODUCT_ROOT_D

root@web:~# ls -al /etc/psa
total 52
drwxr-xr-x   5 root   root    4096 Mar  4 01:08 .
drwxr-xr-x 116 root   root   12288 Mar  4 03:28 ..
drwxr-xr-x   2 root   root    4096 Aug 26  2015 key.d
drwxr-xr-x   2 root   root    4096 Feb 22 06:57 php_versions.d
-rw-r--r--   1 root   root    4023 Mar  1 08:57 php_versions.json
drwx------   2 psaadm root    4096 Feb  6 16:20 private
-rw-r--r--   1 root   root      39 Mar  4 01:08 psa.conf...