Ipfs camp 2019 example error "connection refused"

If I run the ipfs-camp-2019 example of libp2p from go-libp2p-examples/ipfs-camp-2019 at master · libp2p/go-libp2p-examples · GitHub I get this error:

What should I do?

At a glance, it seems like your host probably has a different peer ID than the one that in the hardcoded multiaddr. Try generating the correct multiaddr for the listening host – be aware that you’ll have a new peer ID on each run.