problems while executing polo with pm2 in cluster mode

[adrai]

when using polo an clustering my instances with for example 3 instances I get this error:

[registry-1 (err) 2014-02-10T08:08:00] AssertionError: false == true
[registry-1 (err) 2014-02-10T08:08:00] at Cluster.cluster._getServer (cluster.js:558:3)
[registry-1 (err) 2014-02-10T08:08:00] at listen (net.js:1065:11)
[registry-1 (err) 2014-02-10T08:08:00] at Server.listen (net.js:1127:5)
[registry-1 (err) 2014-02-10T08:08:00] at [object Object].Root.listen (/Users/adrai/Projects/my-prototype/registry/node_modules/polo/node_modules/root/index.js:191:18)
[registry-1 (err) 2014-02-10T08:08:00] at [object Object].Root.listen (/Users/adrai/Projects/my-prototype/registry/node_modules/polo/node_modules/root/index.js:160:49)
[registry-1 (err) 2014-02-10T08:08:00] at listen (/Users/adrai/Projects/my-prototype/registry/node_modules/polo/repository.js:211:6)
[registry-1 (err) 2014-02-10T08:08:00] at proxy (/Users/adrai/Projects/my-prototype/registry/node_modules/polo/repository.js:268:41)
[registry-1 (err) 2014-02-10T08:08:00] at polo (/Users/adrai/Projects/my-prototype/registry/node_modules/polo/index.js:7:13)
[registry-1 (err) 2014-02-10T08:08:00] at Object. (/Users/adrai/Projects/my-prototype/registry/server.js:2:27)
[registry-1 (err) 2014-02-10T08:08:00] at Module._compile (module.js:456:26)
[registry-1 (err) 2014-02-10T08:08:00] at Object.Module._extensions..js (module.js:474:10)
[registry-1 (err) 2014-02-10T08:08:00] at Module.load (/usr/local/lib/node_modules/pm2/node_modules/coffee-script/lib/coffee-script/register.js:45:36)
[registry-1 (err) 2014-02-10T08:08:00] at Function.Module._load (module.js:312:12)
[registry-1 (err) 2014-02-10T08:08:00] at Module.require (module.js:364:17)
[registry-1 (err) 2014-02-10T08:08:00] at require (module.js:380:17)
[registry-1 (err) 2014-02-10T08:08:00] at WriteStream. (/usr/local/lib/node_modules/pm2/lib/ProcessContainer.js:123:7)
[registry-1 (err) 2014-02-10T08:08:00] at WriteStream.EventEmitter.emit (events.js:95:17)
[registry-1 (err) 2014-02-10T08:08:00] at WriteStream. (fs.js:1660:10)
[registry-1 (err) 2014-02-10T08:08:00] at Object.oncomplete (fs.js:107:15)

any idea?