Uncaught SyntaxError: Cannot use import statement outside a module (at login.html:51:5)

This error occurs when you try to use an import statement in a script that is not a module.

To fix this error, you need to ensure that the script that contains the import statement is a module. You can do this by adding the `type="module"` attribute to the script tag, like this:

<script type="module" src="your-script.js"></script>

If you're using ES6 modules, you should also make sure that your server is configured to serve files with the `.mjs` extension with the `Content-Type: application/javascript` MIME type.