can't start juggernaut, EventEmitter.prototype not defined

[raydebug]

when run juggernaut:

/usr/local/lib/node_modules/juggernaut/node_modules/socket.io/lib/store.js:35
Store.prototype.proto = EventEmitter.prototype;
^

TypeError: Cannot read property 'prototype' of undefined
at Object. (/usr/local/lib/node_modules/juggernaut/node_modules/socket.io/lib/store.js:35:41)
at Module._compile (module.js:573:32)
at Object.Module._extensions..js (module.js:582:10)
at Module.load (module.js:490:32)
at tryModuleLoad (module.js:449:12)
at Function.Module._load (module.js:441:3)
at Module.require (module.js:500:17)
at require (internal/module.js:20:19)
at Object. (/usr/local/lib/node_modules/juggernaut/node_modules/socket.io/lib/manager.js:14:13)
at Module._compile (module.js:573:32)