/usr/local/lib/node_modules/homebridge/lib/server.js:230
  var username = config.bridge.username;
                               ^

TypeError: Cannot read property 'username' of undefined
    at Server._loadConfig (/usr/local/lib/node_modules/homebridge/lib/server.js:230:32)
    at new Server (/usr/local/lib/node_modules/homebridge/lib/server.js:56:38)
    at module.exports (/usr/local/lib/node_modules/homebridge/lib/cli.js:32:16)
    at Object.<anonymous> (/usr/local/lib/node_modules/homebridge/bin/homebridge:17:22)
    at Module._compile (internal/modules/cjs/loader.js:701:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:712:10)
    at Module.load (internal/modules/cjs/loader.js:600:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:539:12)
    at Function.Module._load (internal/modules/cjs/loader.js:531:3)
    at Function.Module.runMain (internal/modules/cjs/loader.js:754:12)