Since Next Upgrade Confusing Error

[landed1]

Summary

I upgraded from "next": "15.1.3" to some version I can't find which but I used a >= which I think was 15.2.x where a security update was suggested somewhere- github email I believe.

I am able to render the home page route. Then any other route gives the error. The project is a static blog site using MDX. The error seemed to come from the next update. I edited package.json and pnpm update. I did not get the error at first but I believe that was due to some elements of cache behaviour? It may be worth noting that I was still able to build the project.

The error started out with this:A conflicting public file and page file was found for path /favicon.ico renaming or moving this then gave the following scenario.

Here is the following error

[TypeError: Cannot read properties of undefined (reading 'stack')] {
digest: '3398004295'...

Thank you for any ideas.

Additional information

AI, not really useful and Google same.

Example

No response