Writing error on the three.js portfolio tutorial

Hello
I’ve just follow this tutortial and we avec some errors.
On the creative background with three JS part we can see
import { useSEffect } from 'react'; instead import { useSEffect } from 'react';
And we can read :
Our three.js codes will be written inside a ueEffect function.
instead
Our three.js codes will be written inside a uesEffect function.