Smokeping fail Ubnt18.04 Nginx Librenms Socket issue

Help
1

Installed Librenms via composer/manual as per docs on website. working ok.
Ubnt 18.4 container on Proxmox pve with Nginx as web server.
installed ssl/https for security , all working ok.

installed smokeping as per instructions
( https://docs.librenms.org/Extensions/Smokeping/ )

access to https://myserver/smokeping/ gives a 502 error.
looking in the logs gives me :
connect() to unix:/var/run/fcgiwrap.socket failed (2: No such file or directory) while connecting to upstream

i searched more logs but have no clue where to look. anyone ?

2

always my story, when i post the question i find an answer !

seems it was missing the fcgiwrapper package ?

so , sudo apt install fcgiwrapper
changed permission chmod +x /etc/init.d/fcgiwrap .

source
https://www.nginx.com/resources/wiki/start/topics/examples/fcgiwrap/