Supports sending of Lightweight Communications and Marshalling (LCM) datagrams. (https://lcm-proj.github.io/)
LCM requires a valid multicast route. If this is a Linux computer and it is simply not connected to a network, the following commands are usually sufficient as a temporary solution:
sudo ifconfig lo multicast sudo route add -net 224.0.0.0 netmask 240.0.0.0 dev lo