Layouts Break Window Load

[BellaMay95]

I tried to implement a layout for one of my windows, but when I try to open the window with a layout it fails with the "unable to load application interface" error.

I initialize the layout in my main process with:
windowManager.init({ ..... layouts: { default: 'layout.html' } });

and when I open the window I open it with:
var win2 = windowManager.open(false, appName, url, false, { frame: false, show: false, useContentSize: true, webPreferences: { preload: preload }, layout: 'default' }); ..... win2.object.show();

It doesn't matter what I put in the layout.html file, I have tried just pasting what is in the README.md example and it doesn't work.