erro node

gistfile1.txt

net.js:391
    throw new Error('Socket is not writable');
          ^
Error: Socket is not writable
    at Socket._writeOut (net.js:391:11)
    at Socket.write (net.js:377:17)
    at EventEmitter.<anonymous> (/Users/herminio/Projects/node/nodejs-fnando/chat-tcp.js:12:12)
    at EventEmitter.emit (events.js:81:20)
    at Socket.<anonymous> (/Users/herminio/Projects/node/nodejs-fnando/chat-tcp.js:28:15)
    at Socket.emit (events.js:64:17)
    at Socket._onReadable (net.js:672:14)
    at IOWatcher.onReadable [as callback] (net.js:177:10)