I embedded WebGL game to Next.js website. This is the error that shows in the console and the game does not load.

Here is the actual game embed:

Here is my File structure:

I am trying to use Iframes to embed the game, here is my page:

import React from 'react'

const Test = () => {
  return (
    <div className='w-full h-full flex flex-col items-center justify-center'>
        <h1>
            Untiy GAme
        </h1>
        <iframe src="/Game/index.html"
        width="960"
        height="600"
        allowFullScreen
        title="Unity WebGL Game"></iframe>
    </div>
  )
}

export default Test

The website itself is hosted on cloud flare.
Thank you for your help!