Welcome to the Prismic community, and thanks for reaching out to us.
Does the solution provided by @frags work for you? I believe the same mistake is here. Let me know if it works for you; otherwise, I'll be happy to troubleshoot the issue.
Looking at your prismic.io js file, it seems you haven't updated the routes array to match your project's route structure. Can you share the repo name and the folder structure of the project?
I have checked your project files and found multiple issues that you need to fix.
To import prismicio in the about/page.js: file, the path should be: import { createClient } from "../../../prismicio"
And on the page.js file, the path should be: import { createClient } from "../../prismicio"
That way, it will remove the no documents returned error.
Next, you will get another error Error: [Link resolver error] Unknown type because your routes option should reflect the folder structure of your Next.js project. You need to correct that one. Please follow the define path article: Define Paths with Next.js - Documentation - Prismic
We have the simple starter project in Next js that will be helpful for you.
That worked like a charm, I did not realize that createClient was imported from 'prismicio.js' file, everything working perfect now. Thanks a lot for your help!.
note: I have deleted the threads with the names to my github & prismic repo.