Cannot get index.html / Node.js

i'm new on forum and and of course i have problem because i'm new also in web development. Dont know how meany of you are familiar with project on Git MM (https://github.com/MichMich/MagicMirror)... It is a web app that can be run on desktop, it was written using Frameworks Electron.js and Node.js (Javascript). I tray to add my own page in html linked from modul written in Javascript, but every time i tray to open local page i get "Cannot GET ~/index.html", google and other websites work great. MM allready have webport and all other server side up, allthing start ower npm command menager. Now my question is do i have to add something in my configuration file that call that local html and bypass that error or something else. Dont have code now, will post you tomorow. Is everyone have meet with this problem, and have can i solve it? Thank you, Regards

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