VPN clients for Mac's

Question

We use Tunnelblick for a VPN client with our Macs and we are now getting the above error screen. Has anyone else seen this that uses Tunnelblick? I have opened a ticket with support to let them know of the issue. Looking for suggestions for other clients that might be available. 
 
 Thank you, 
 Eric Speake 
 IT manager 
 Digital Monitoring Products

LuCar Toni · Accepted Answer

Actually it is interesting. 
 As you can see here: https://community.openvpn.net/openvpn/wiki/DeprecatedOptions 
 This option is called Deprecated, but not removed. 
 Therefore you can leave it in the configuration until OpenVPN decides to remove it. 
 Tunnelblick actually decide to show this for whatever reasons. 
 OpenVPN had plans to remove it in 2.5, but did not, instead does not list any remove version for now (seems like there were issues with the removal). 
 https://github.com/Nyr/openvpn-install/issues/430