What is this error and why isn't null the right choice?

Question

The error I keep receiving when I use null, per the tutorial I'm following for a modal set up in React (using VSC) gives me this:

TypeError: setSelectedImage is not a function
handleClick
src/components/modal.js:8
   5 | const handleClick = (e) => {
   6 |     if(e.target.classList.contains('backdrop'))
   7 |     {
>  8 |         setSelectedImage(null);
     | ^   9 |     }
  10 |     
  11 |     

My Modal.js file is:

import React from 'react';

const Modal = ({ selectedImage , setSelectedImage}) => {

    const handleClick = (e) => {
        if(e.target.classList.contains('backdrop'))
        {
            setSelectedImage(null);
        }
        
        
    };

    return (
        <div className="backdrop" onClick={handleClick}>
            <img src={selectedImage} alt="enlarged pic" />
        </div>
    )
}

export default Modal;

Where its being used:

import GridGallery from "./components/grid-gallery";
import React, {useState} from 'react';
import Modal from './components/modal';
import './components/modal.css';
import "./index.css";

export default function Gallery()
{
    const [selectedImage, setSelectedImage] = useState(null);
    const images = 
    [
        '../images/SplashPgConc.png',
        "../images/Wolf.png",
        "../images/SplashPgConc.png",
        "../images/Wolf.png",
        "../images/SplashPgConc.png",
        "../images/Wolf.png",
        "../images/SplashPgConc.png",
        "../images/Wolf.png",
        "../images/SplashPgConc.png",
        "../images/Wolf.png",
        "../images/SplashPgConc.png",
        "../images/Wolf.png"
    ];
    return (
        <div className="items-center">
            <GridGallery images={images} setSelectedImage={setSelectedImage} />
             {selectedImage && <Modal selectedImage={selectedImage} setSelectedImage={setSelectedImage}/> }
        </div>

    );
}

And Grid Gallery for more context:

import { useState } from "react";
import VisibilitySensor from 'react-visibility-sensor';


export default function GridGallery({images ,setSelectedImage}){
    const [imagesShownArray, setImagesShownArray] = useState(
        Array(images.length).fill(false)
    );

    const imageVisibleChange = (index, isVisible) => {
        if(isVisible){
            setImagesShownArray((currentImagesShownArray) =>{
                currentImagesShownArray[index] = true;
                return [...currentImagesShownArray];
            });
        }
    };


    return(
        <div className= "grid grid-cols-3 gap-2">
            {images && images.map((imageUrl, index)=> (
                <VisibilitySensor
                key={index}
                partialVisibility={true}
                offset={{ bottom: 80 }}
                onChange={(isVisible) => imageVisibleChange(index, isVisible)}
              >
                <GridGalleryCard
                  imageUrl={imageUrl}
                  show={imagesShownArray[index]}
                  setSelectedImage={setSelectedImage}
                />
              </VisibilitySensor>
            ))}
        </div>
    );

};
        
function GridGalleryCard({ imageUrl , show , setSelectedImage}) 
{
    return (
                <div className={`relative transition ease-in duration-300 transform ${
                    show ? "" : "translate-y-16 opacity-0"
                }`} onClick={() => setSelectedImage(imageUrl)}>

                    <div className="absolute inset-0 z-10 flex transition duration-200 ease-in hover:opacity-0">
                        <div className="absolute inset-0 bg-black opacity-70"></div>
                        <div className="mx-auto text-white z-10 self-center uppercase tracking-widest text-sm">
                            Hello World
                        </div>
                    </div>
                    <img src ={imageUrl} />
                </div>
       
    );
}

I am super confused why using null with the setSelectedImagethrows an error, would anyone be able to clarify this and what I am doing wrong? It all works just right up until I click off the picture, then it throws the error instead of closing the modal. I'm really proud of myself for actually making it this far.