I have a cascade of routers with LAN-to-WAN connection, both routers work fine, I can use Internet etc, but for the reason I don't understand, I can't activate OpenVPN on my second router. Even though, in my previous apartments I was able to activate VPN and connect to Internet through it.
I have different IP addresses on my two routers: 192.168.1.1 and 192.168.2.1, DHCP is enabled on the second router. Here's the error message I get: