login http://localhost/socket.io/?EIO=3&transport=polling&t=LwT11ve. No 'Access-Control-Allow-Origin' header is present on the requested resource

[YizZ-16]

setup server success, when login occur networkerror ('critical error')
$ gulp build-dist
$ node src/server/main.js
I do see the login page.
However, after I insert the info and press sign in,
a pop out window shows:
Network Error
Critical Error
What might be the problem and how do I fix it?