Error using production build

[josuesan]

Hello community, could you help me with a small problem:
When creating a production build, I run npm start to verify and I start to get strange errors in the browser console.
They are requests to a path that effectively does not have those files but I have no idea why they are made and how to fix it.

I share a photo about it

Does anyone know anything about it? Thank you very much in advance !