[Help] How to fix nil values? (global 'WashVehicle')

Hello, I just started my test server and want to learning a bit about esx coding.
I got this free car wash script ( [FREE] Advanced Carwash script for | qb-core | ESX | standalone | - #27 by Galdous ) to add on for my official rp server but I’m getting this error.


How do I fix it?

You either moved or deleted the WashVehicle function of my script you should just redownload it and try it again without editing stuff first other than what is said to edit in the README.

nil means something doesn’t exist. That it’s not defined.
If you’re trying to call a nil value, it means you’re trying to call a function that doesn’t exist.