Error on Media Field

System Information
  • Strapi Version: 4.0.1
  • Operating System:
  • Database:
  • Node Version:
  • NPM Version:
  • Yarn Version:

Hello, First of all sorry for my English…

I have the following error, I have created a Single Type to load two pdf’s.
The problem is that the API does not return any value of those fields.
I am working locally, in version 4.0.1

I attach screenshots.