How do I get npm to start?

I am currently trying to get npm to work with a github project and am very new to the GitHub scene. Currently working on Windows 10 in the Command Prompt.

The installation with npm install seemed to work fine, but when I try to npm run directly after installing, I get a whole list of errors.

Everything builds fine except for this one thing:

./js/content.js 740 bytes {0} [built] [11 errors]

and the error messages I get all are formatted as follows:

ERROR in ./js/content.js
Module not found: Error: Cannot resolve 'file' or 'directory' ../content/home.md in C:\Users\My_Name\Desktop\FILE\file-folder/js @ ./js/content.js 6:10-39'

What am I doing wrong?

via Collin Abidi