pm2 start on public Error

[metal-young]

TypeError: hex is not a function
    at Function.from (native)
    at Function.from (native)
    at Object.<anonymous> (/root/ipfs-pubsub-room-demo/node_modules/ethereumjs-block/node_modules/ethereumjs-util/index.js:31:28)
    at Module._compile (module.js:410:26)
    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> (/root/ipfs-pubsub-room-demo/node_modules/ethereumjs-block/header.js:1:77)

[jacobandresen]

which node version are you running?

[metal-young]

sorry,The problem is solved。
And then have a new question that has been submitted to ipfs/js-ipfs#963