Unable to create RoonServer folder on Synology 716 + II Nas

I am using Synology Nas 716 + II.
I want to install roon core on Nas, but RoonServer folder is not created. Folders such as roonserver, Roonserver, and Roon Server are created.
About a year ago I installed and played RoonServer and deleted it. But now the same Nas, RoonServer folder is not created.
What is the problem?

DS716 + II
INTEL Celeron N3160, 1.6 GHz, 4 CPU core
8192 MB Memory
DSM 6.2.2-24922 Update 3

From Roon Server on Synology Diskstations: