New to modding and cant figure out why i'm getting this error

https://preview.redd.it/01nxqmjewhng1.png?width=1462&format=png&auto=webp&s=1f6d8ab64cd64311f13b01ea5090a7dfd649b07c

ive watched a bunch of tutorials but none cover this... if anyone can help it would be greatly appreciated