New OMV server build error "No network interface(s) available"

Hi,

I am building a new OMV server based on:
- Asus P10S WS motherboard (2 X Intel I210 GbE nic's)
- M2 Kingston SSDNow UV500 240GB (for "OMV" OS)
- 8 X 6TB WD RED harddisks (for storage)

I have used the latest iso "openmediavault_4.1.3-amd64"
But after (succesful) installation, by first boot I get the message:
"No network interface(s) available"

Strange because during install, "configuring the network", I got the message "Network autoconfiguration succeeded"

Step 2)
then I place an older Intel PCI-E Server NIC on the motherboard (Intel pro/1000 pt) and reinstalled OMV again
during install no problems, but by first boot I got again the error "No network interface(s) available"....

Question: is this maybe because of the DHCP server security restritions on the network were I am working?
or is there something else going wrong?

After logging in as root, and typing: ifconfig i get "command not found" (?)
ping to google (8.8.8.8) works
but pinging to other computers in my network not....

After typing: cat /etc/network/interfaces

# The loopback network interface
auto lo
iface lo inet loopback

#The primary network interface
allow-hotplug enp4s0
iface enp4s0 inet dhcp

I don't understand what above means, and that I can ping google (I have also internet access) but OMV reports after install:
"No network interface(s) available" ?

Thank you all, it's working now!
The problem was that on the office were I was configuring there was a complicated network structure,
so with DHCP enabled, the server didn't got a proper ip address,
Now I have connected the server and the control pc on a different little Gb switch with fixed ip addresses
and I have connection now

Thank you all for the advise!