First, could you tell more specific configuration? I can't understand " i am getting Relay DHCP to another Server & where i gave DHCP server IP & when i gave DHCP server IP". Usually, "The DHCP option must be a valid integer." means you gave incorrect address or format.
Second, yes. You need to add DHCP subnet to AutoVPN tunnel to relay DHCP request to that server.
we have US DHCP server IPs like :- 10.X.X.X & DHCP servers are in Data Center .
So in Cisco Router we configure These DHCP IP's as a helper address but here think its asking Subnet that we did not give .
that is my query .
Second, yes. You need to add DHCP subnet to AutoVPN tunnel to relay DHCP request to that server: you means that the DHCP server Subnet we need to add in AutoVPN ( how do you have any link where we add subnet Autovpn )?