master Certificate Authority (CA) certificate and key

error on generating the master Certificate Authority (CA) certificate and key, I am following the installation guide of ubuntu lts VPN installation. I am new user of this system..help please.. tnx

root@oldibm:/etc/openvpn/easy-rsa# ./clean-all

root@oldibm:/etc/openvpn/easy-rsa# ./build-ca
grep: /etc/openvpn/easy-rsa/openssl.cnf: No such file or directory
pkitool: KEY_CONFIG (set by the ./vars script) is pointing to the wrong
version of openssl.cnf: /etc/openvpn/easy-rsa/openssl.cnf
The correct version should have a comment that says: easy-rsa version 2.x

root@oldibm:/etc/openvpn/easy-rsa#