I've installed nmap in my Mac OS X tried.
I'm not on Linux, I couldn't find the script directory. I ran
sudo nmap -sV --script vulners 184.108.40.206
I kept getting
Starting Nmap 6.49BETA4 ( https://nmap.org ) at 2020-01-07 14:35 EST NSE: failed to initialize the script engine: /usr/local/bin/../share/nmap/nse_main.lua:801: 'vulners' did not match a category, filename, or directory stack traceback: [C]: in function 'error' /usr/local/bin/../share/nmap/nse_main.lua:801: in function 'get_chosen_scripts' /usr/local/bin/../share/nmap/nse_main.lua:1249: in main chunk [C]: in ? QUITTING!
Do you know what I did wrong ?