Login Issues

There seems to be an issue when you initially install Ajenti. For example, I have Debian 8 fresh install on the machine and just installed Ajenti. But when I navigate to https URL with port 8000 so it was encrypted I get this error: http://imgur.com/AG4dBjb

But when I edited the configuration and removed ssl, I am able to login:

http://imgur.com/y1cLgu7

Why does this happen? How to fix?