Thanks navaismo. You were right, I changed the vars and certificates were produced properly. But now I have another issuw in case someone wants to help. I cannot connect and from the logs I see these messages:
Jun 12 13:02:17 issabel openvpn: Mon Jun 12 13:02:17 2017 78.87.126.197:53413 TLS: Initial packet from [AF_INET]78.87.126.197:53413, sid=938a287b f2edf19f
Jun 12 13:02:17 issabel openvpn: Mon Jun 12 13:02:17 2017 78.87.126.197:53413 VERIFY ERROR: depth=0, error=CRL signature failure: C=GR, ST=GR, L=Greece, O=Urban Networks, OU=Network, CN=Issabel, name=freesunday.localhost, emailAddress=e.patiniotakis@gmail.com
Jun 12 13:02:17 issabel openvpn: Mon Jun 12 13:02:17 2017 78.87.126.197:53413 OpenSSL: error:140890B2:SSL routines:SSL3_GET_CLIENT_CERTIFICATE:no certificate returned
Jun 12 13:02:17 issabel openvpn: Mon Jun 12 13:02:17 2017 78.87.126.197:53413 TLS_ERROR: BIO read tls_read_plaintext error
Jun 12 13:02:17 issabel openvpn: Mon Jun 12 13:02:17 2017 78.87.126.197:53413 TLS Error: TLS object -> incoming plaintext read error
Jun 12 13:02:17 issabel openvpn: Mon Jun 12 13:02:17 2017 78.87.126.197:53413 TLS Error: TLS handshake failed
Jun 12 13:02:17 issabel openvpn: Mon Jun 12 13:02:17 2017 78.87.126.197:53413 SIGUSR1[soft,tls-error] received, client-instance restarting
Can anyone help?