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Не могу решить проблему TypeError: Cannot set property 'innerHTML' of null


Crazy54789
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Question

function showModal(id) {

    document.getElementsByClassName(`modal-1`)[0].classList.add('active')
}

function closeGame(id) {

    document.getElementsByClassName(`modal-1`)[0].classList.remove('active')
}

function getRandomImage() {
        var imgArray =
                ['<img src="img/0.jpg" alt="#" />',
                '<img src="img/1.jpg" alt="#" />',
                '<img src="img/2.jpg" alt="#" />',
                '<img src="img/3.jpg" alt="#" />',
                '<img src="img/4.jpg" alt="#" />',
                '<img src="img/5.jpg" alt="#" />',
                '<img src="img/6.jpg" alt="#" />',
                '<img src="img/7.jpg" alt="#" />',
                '<img src="img/8.jpg" alt="#" />',
                '<img src="img/9.jpg" alt="#" />',
                '<img src="img/10.jpg" alt="#" />'];
        var rand = Math.floor(Math.random() * imgArray.length);
        var randImg = imgArray[rand];
        var imgTag = document.getElementById('img');
        imgTag.innerHTML = randImg;
}
window.onload = getRandomImage;

Вот здесь выдает ошибку в строке imgTag.innnerHTML = randImg;

HTML код

 

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Lr_8</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>

    <input class="player-name" value ="Print your nickname..."></input>
    <button class="play" onclick="showModal(1)">Play</button>

    <div class="modal modal-1">
        <div class="modal-window">

            <div class="modal-header">
                <h4 class="title">Lr_8</h4>
                <div class="close" onclick="closeGame(1)">&times;</div>
            </div>

            <div class="modal-body">

                <div class="img_">
                    <div class="img img-player"></div>
                    <div class="img img-enemy"></div>
                </div>

                <div class="nickname">
                    <output class="player"></output>
                    <output class="enemy"></output>
                </div>

                <div class="point_">
                    <div class="point point-player"></div>
                    <div class="point point-enemy"></div>
                </div>

                <div class="number_">
                    <div class="number number-player"></div>
                    <div class="number number-enemy"></div>
                </div>

                <div class="number_">
                    <button class="generate" onclick="generateNum()"></button>
                </div>

            </div>

                </div>
            </div>
        </div>
    </div>
</body>
<script src="script.js"></script>
</html>

Я студент, только учусь вебу возможно код кривой ехех

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