Syntax error when starting server

[Anders Persson]

I try to start the server with 

./peerjs --port 9999 --key peerjs --path /myapp

and get this message:

/home/user/PeerServer/peerjs-server/src/index.js:9

const init = ({ app, server, options }) => {

              ^

SyntaxError: Unexpected token {

    at exports.runInThisContext (vm.js:53:16)

    at Module._compile (module.js:374:25)

    at Object.Module._extensions..js (module.js:417:10)

    at Module.load (module.js:344:32)

    at Function.Module._load (module.js:301:12)

    at Module.require (module.js:354:17)

    at require (internal/module.js:12:17)

    at Object.<anonymous> (/home/anders/PeerServer/peerjs-server/bin/peerjs:7:20)

    at Module._compile (module.js:410:26)

    at Object.Module._extensions..js (module.js:417:10)

What can I have done wrong?

Anders