Request from ::1: POST [url] ... Response with status 404 in 1 ms

Greetings,
I installed netlify dev, and for some reason, the POST request returns a 404 when I fetch from the ./netlify/functions/fetch.file.js.

I have tried fetching e.g. test.js other files in the root directory, But keep getting the same error.

+.netlify
+netlify
|functions
|fetch.file.js
+node_modules
+public
+src

|package.json
|test.js

Please how do I solve this?

Would you mind sharing your site name?