Keep asking username and password

[ProgrammerNomad]

Hello,
I just uploaded on my server root and it asking username and password on alert like authentication and not getting logged success at all.

I am using default username and password: Username: admin Password: protect

Screenshot: http://prntscr.com/hpx26u

[ProgrammerNomad]

As per help i have put private $authentication = null; so start working but why its not working with authentication?

[nmslwsnd]

您好，被验证密码保护了

[derak29]

Asking password .. Username: admin Password: protect no working