error with rrdcached plugin with a clean install of OMV4.

Hi all,
OMV 4.1.22
AMD64 machine

I have the following error flooding my logs :

rrdcached plugin: Failed to connect to RRDCacheD at unix:/var/run/rrdcached.sock: Unable to connect to rrdcached: No such file or directory (status=2)

before that I have the following:
" read-function of plugin `rrdcached' failed. Will suspend it for 40.000 seconds."

Anyone have an idea how to fix this?

Ok answer my own question:

It seems that SystemD cannot start properly rrcached service (this is an /etc/init.d/ compatible script) because it calls /sbin/start-stop-daemon. BUT start-stop-daemon is blank. The real script is called /sbin/start-stop-daemon.REAL.

You have to move back the real script:

#cd /sbin/
#mv start-stop-daemon.REAL start-stop-daemon


#/etc/init.d/rrdcached stop
#/etc/init.d/rrdcached start


or 


#systemctl stop rrdcached
#systemctl start rrdcached

Now it's ok.