FFMPEGWASM won’t load version 12 reference error

I’ve written a simple script to load FFMPEGWASM but it gives an error:

Error loading FFmpeg: ReferenceError: Can’t find variable: FFmpeg

Full code is here

<h1>FFmpeg Loading Example</h1>
<p id="message"></p>
<script src="https://cdn.jsdelivr.net/npm/@ffmpeg/[email protected]/dist/umd/ffmpeg.min.js"></script>
<script>
    document.addEventListener("DOMContentLoaded", async () => {
        const message = document.getElementById('message');
        try {
            const ffmpeg = new FFmpeg();
            message.innerText = 'Loading FFmpeg...';
            await ffmpeg.load();
            message.innerText = 'FFmpeg loaded successfully!';
        } catch (error) {
            console.error('Error loading FFmpeg:', error);
            message.innerText = 'Error loading FFmpeg.';
        }
    });
</script>