error with start openVPN service

I trying to install openVPN on ubuntu from this tutorial How To Set Up an OpenVPN Server on Ubuntu 16.04

in Step 9: Start and Enable the OpenVPN Service

when I enter ``` sudo systemctl start openvpn@server

to start the service. the CLI shows me this error message

Job for openvpn@server.service failed because the control process exited with error code. See “systemctl status openvpn@server.service” and “journalctl -xe” for details.

so. please how I can fix it?
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Hello I’ve run into the same error and the solution for me was to :

systemctl enable openvpn-server@server.service

instead of “openvpn@server.servcice”

then start the service:

systemctl start openvpn-server@server.service

I assume your config file is server.conf and it’s under /ets/openvpn/server folder

hope it helps

Create the ta.key file by running: cd /etc/openvpn openvpn --genkey --secret ta.key systemctl start openvpn@server.service

Just comment out the LimitNPROC line in /lib/systemd/system/openvpn@.service. Reboor system after that. Enter again sudo systemctl start openvpn@server and the mistake have to disapear.