Options error: You must define TUN/TAP device (--dev)

[Palette]

Hi everyone,
well i got a problem to connect on my vpn found on vpnbook.com, when i try to connect, it fail and the error log file get me the following lines:
Thu Jan 2 08:34:32 2020 disabling NCP mode (--ncp-disable) because not in P2MP client or server mode
Options error: You must define TUN/TAP device (--dev)
Use --help for more information.

So i've checked the config file of the vpn i wanted to use, and, maybe i'm dumb, but there's already a "dev tun3" in the file, see:
client
dev tun3
proto tcp
remote 198.7.58.147 80
remote us2.vpnbook.com 80
resolv-retry infinite
nobind
persist-key
persist-tun
auth-user-pass
comp-lzo
verb 3
cipher AES-128-CBC
fast-io
pull
route-delay 2
redirect-gateway


So, i specify that i'm a new user of linux and in the network in general, excuse me if this is a dumb solution or something i try to understand everything that i'm doing but im on this problem since yesterday,it drive me crazy, if someone have an idea^^

Thanks for reading me!