A fresh clone was needed. The upgrade from 0.1.x to 0.2.2 was the issue.
(sorry, I should have tested this route earlier)
There is some problems on regarding to socket.io, so I need to revert code to see the changes between previous version and the latest, but unfortunately, NodeBB officials does not provide such tags since 1.2.2? I want to know how could I get previous stable version of forum code when possible?
Sorry, it seems that git tags does not shipped with code. So downloaded tags are not completed, when I tapped
git tag command.
However github has its completed tags.
See this link: https://github.com/NodeBB/NodeBB/compare?expand=1