VPN connection between OPNsense and IPFire

[TheEmerica]

Hello,
Im trying to establish openvpn connection between OPNsense and IPFire but with no luck.
I made OPNsense as my openVPN server, did the client export and now im trying to import it in IPFire but it doesnt let me. Unzipped the file and took out .key file and rezipped it with only two files inside: .conf and .p12 file. After hitting upload i get "500" internal error and thats it.
Does anyone have experience in those two connections maybe?