I create new site (subdomain) from my main site. The 404

I create new site (subdomain) from my main site. The 404 error occurred when I click Dashboard, and when I checked the file inside the new site folder it has only 2 files. What do I do wrong? Could somebody help me out? I have 3 screen shot to support this message.

Kindly regards,
Suhartono Kusumo