Error trying to access an URL from my NEXTJS site

Question

I have the following problem. I have a website that I've created using NextJS and I've created some different dynamic pages into it. The problem occurs when I try to access the URL of those dynamic pages from any place that's not my navbar, or when I reload one of these dynamic pages: it gives me a 404 screen and I don't know exactly what causes this inconvenient.

Next Config.js file

module.exports = {
  reactStrictMode: true,
  trailingSlash: true,
}