Error with setting up OpenVPN Client files?

I have been trying to set up multiple OpenVPN Client files for use on multiple computers.

The guide I am following is : https://www.digitalocean.com/community/tutorials/how-to-setup-and-configure-an-openvpn-server-on-centos-7

One of the instructions while setting up is as follows:

Make sure that if you do this you give them descriptive names, but for now we’re going to have one client so we’ll just call it client.

cd /etc/openvpn/easy-rsa ./build-key client

As such, I simply ran the buildkey with different client names (client00,client01 etc.).

The config file I have modified as such:

client00
dev tun
proto udp
remote x.x.x.x 1194
resolv-retry infinite
nobind
persist-key
persist-tun
comp-lzo
verb 3
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</ca>
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-----END PRIVATE KEY-----
</key>

However the GUI gets stuck on connecting.

I ran the CMD

Options error: Unrecognized option or missing parameter(s) in client00.ovpn:1: client00 (2.3.10)

What am i doing wrong?