vue-router.esm.js?8c4f:2314 TypeError: Cannot read properties of undefined (reading 'documentElement')

This error message indicates that there is an attempt to access a property called 'documentElement' on an undefined object. This could be caused by a few different things:

1. The Vue router is not properly installed or configured in your project.
2. There is a problem with the HTML document that the router is trying to access.
3. There is a problem with the server that is serving the HTML document.

To resolve this issue, you can try the following steps:

1. Make sure that the Vue router is properly installed and configured in your project.
2. Check the HTML document for any errors or missing elements that may be causing the problem.
3. Check the server logs for any errors or issues that may be causing the problem.

If none of these steps resolve the issue, you may need to seek further assistance from a developer or technical support team.