Tunnelblick Options error: Unrecognized option or missing parameter(s) in tls-crypt (2.3.17)

OpenVPN added tls-crypt functionality in version 2.4+. Tunnelblick defaults to using OpenVPN 2.3.7 in the settings for some reason, even in the latest releases (from what I have experienced). So just update the 'OpenVPN' version in the 'Settings' menu of Tunnelblick to 2.4+ and you should be good to go!