Options error: --tls-auth fails with 'ta.key': No such file or directory

When trying to coect my Linode to my home OpenVPN server I get the error message; sudo openvpn --config .openvpn_keys/linode.ovpn Options error: --tls-auth fails with 'ta.key': No such file or directory Options error: Please correct these errors. Use --help for more information.

I have the ta.key in the folder with my .opvn file

This occurs when I enter the following command; sudo openvpn --config .openvpn_keys/linode.ovpn