only apache webserver works nginx not working

we recently installed free version of cwp and could do setup

but when we choose Setup default Web Servers as apache then php file loads and works
but when we choose niginx or any other combination php file does not work

when we go to site we see default cwp msg
HTTP Test Page
powered by CWP | CentOS-WebPanel.com


here is screenshot

https://way2enjoy.com/a/12/7cd5f860e51755f0b762


but when we go sitehome page and try to load index.php directly we get this
 
https://way2enjoy.com/a/12/f8a87a7298418c8d4107

are we not allowed to run nginx in free cwp ??