Why can't access localhost:8080 when I'm node run-demo.js

[handoing]

console show :
loading python module->./lib/python2.7/encodings/init.py
loading python module->./lib/python2.7/codecs.py
loading python module->./lib/python2.7/encodings/aliases.py
loading python module->./lib/python2.7/encodings/ascii.py
loading python module->./python_to_pythonjs.py

[StudentPL]

I have exacly the same problem on Windows and Ubuntu. Did you solve it?