Inability to configure IP Multicast Forwarding

I am unable to configure IP Multicast Forwarding as I have done for IP Unicast Forwarding.

Please advise how to facilitate IP Multicast Forwarding.

jonathan@Quagga:~$ systemctl status systemd-sysctl.service
● systemd-sysctl.service - Apply Kernel Variables
   Loaded: loaded (/lib/systemd/system/systemd-sysctl.service; static; vendor preset: enabled)
   Active: failed (Result: exit-code) since Wed 2017-07-12 20:25:38 AEST; 1h 21min ago
     Docs: man:systemd-sysctl.service(8)
           man:sysctl.d(5)
 Main PID: 268 (code=exited, status=1/FAILURE)

Jul 12 20:25:37 Quagga systemd[1]: Starting Apply Kernel Variables...
Jul 12 20:25:38 Quagga systemd-sysctl[268]: Couldn't write '1' to 'net/ipv6/conf/all/mc_forwarding', ignoring: Permission denied
Jul 12 20:25:38 Quagga systemd-sysctl[268]: Couldn't write '1' to 'net/ipv4/conf/default/mc_forwarding', ignoring: Permission denied
Jul 12 20:25:38 Quagga systemd-sysctl[268]: Couldn't write '1' to 'net/ipv4/conf/all/mc_forwarding', ignoring: Permission denied
Jul 12 20:25:38 Quagga systemd-sysctl[268]: Couldn't write '1' to 'net/ipv6/conf/default/mc_forwarding', ignoring: Permission denied
Jul 12 20:25:38 Quagga systemd[1]: systemd-sysctl.service: Main process exited, code=exited, status=1/FAILURE
Jul 12 20:25:38 Quagga systemd[1]: Failed to start Apply Kernel Variables.
Jul 12 20:25:38 Quagga systemd[1]: systemd-sysctl.service: Unit entered failed state.
Jul 12 20:25:38 Quagga systemd[1]: systemd-sysctl.service: Failed with result 'exit-code'.
jonathan@Quagga:~$ cat /etc/sysctl.conf | grep forwarding=1
net.ipv6.conf.all.forwarding=1
net.ipv4.conf.all.forwarding=1
net.ipv4.conf.default.forwarding=1
net.ipv6.conf.default.forwarding=1
net.ipv4.conf.all.mc_forwarding=1
net.ipv4.conf.default.mc_forwarding=1
net.ipv6.conf.all.mc_forwarding=1
net.ipv6.conf.default.mc_forwarding=1
jonathan@Quagga:~$ sudo sysctl -p
net.ipv6.conf.all.forwarding = 1
net.ipv4.conf.all.forwarding = 1
net.ipv4.conf.default.forwarding = 1
net.ipv6.conf.default.forwarding = 1
sysctl: setting key "net.ipv4.conf.all.mc_forwarding"
sysctl: setting key "net.ipv4.conf.default.mc_forwarding"
sysctl: setting key "net.ipv6.conf.all.mc_forwarding"
sysctl: setting key "net.ipv6.conf.default.mc_forwarding"
jonathan@Quagga:~$