Angular tutorial: Nodejs and certificate issue

Angular tutorial: Nodejs and certificate issue

I try to set up this application:
However, when I launch the server (nodejs), I get this error:
Angular App Server - listening on port: 3000
Angular App Server - listening on secure port: 8433
Unauthenticated
127.0.0.1 - - [Sun, 08 Sep 2013 10:18:12 GMT] "GET / HTTP/1.1" 200 739 "-"
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_4) AppleWebKit/536.30.1
(KHTML, like Gecko) Version/6.0.5 Safari/536.30.1"
Unauthenticated
Unauthenticated
127.0.0.1 - - [Sun, 08 Sep 2013 10:18:12 GMT] "GET /current-user HTTP/1.1"
200 24 "http://localhost:3000/" "Mozilla/5.0 (Macintosh; Intel Mac OS X
10_8_4) AppleWebKit/536.30.1 (KHTML, like Gecko) Version/6.0.5
Safari/536.30.1"
events.js:72
throw er; // Unhandled 'error' event
^
Error: SELF_SIGNED_CERT_IN_CHAIN
at SecurePair.<anonymous> (tls.js:1350:32)
at SecurePair.EventEmitter.emit (events.js:92:17)
at SecurePair.maybeInitFinished (tls.js:963:10)
at CleartextStream.read [as _read] (tls.js:463:15)
at CleartextStream.Readable.read (_stream_readable.js:320:10)
at EncryptedStream.write [as _write] (tls.js:366:25)
at doWrite (_stream_writable.js:219:10)
at writeOrBuffer (_stream_writable.js:209:5)
at EncryptedStream.Writable.write (_stream_writable.js:180:11)
at write (_stream_readable.js:573:24)
Why might this issue occur? How could I fix it?