Need help with Notion API error in Next.js API

I am looking for a developer who can help me fix an API error in my Notion integration on my Next.js API. I am using Notion to keep track of my personal tasks and projects, but have been experiencing issues with the API connection. The primary goal of this project is to fix the error and ensure that the Notion integration is working smoothly.

Ideal skills and experience for this job include:
- Strong experience with Next.js and API integrations
- Familiarity with Notion API and its functionality
- Knowledge of JavaScript and RESTful APIs

The deadline for completing this project is within a week, so I am looking for someone who can work efficiently and effectively to resolve the issue in a timely manner.

You will be invited to the github repo once you accept the project!
error:
https://gist.github.com/TechWithTy/a01ca744a8aa0c7b74514be2bb2378b9
functions used to get error:
https://gist.github.com/TechWithTy/13491b7ce7c41069d2de0d9ee7105fbc

To be considered please answer this question::

How are API routes handled in next.js?

project will be concidered complete when Get Post Read And Delete methods work within my next.js API route
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Project builds with npm run build