Hi,
It's solved!
I checked all configurations. So, when I check my web sites configuratins, I see that they haven't any IP address assigned to it. I think it's about adding IPv6 support in version 10.2.0.
So I tried to assign an IP to each domain via "Change Hosting Setting" button in the each domain custom page, manually. After that Error has removed and also I restart httpd. Now, I haven't apache default page and web sites are healthy. Also I haven't that problem about Server Health in the panel.
At the moment I have just one problem and it's that I upgrade panel to 10.2.0 but it's show 10.1.1, yet!
It's so strange! I have some servers and I haven't any problems to upgrade with them, but this one has these errors.