Could you please try opening up the build.js file and removing the windows version from the compile lists? I think it might be trying to load a wine dependency that isn't working.
You were right, the app built once I commented out 'win64' in the platforms. The icon still didn't work, though.
Just so you know, I went with an Electron app for my own project, but I am happy to help you troubleshoot the icon issue if you'd like me to.
Yeah if you want to try and tackle it, go ahead!It's looking for something from WINE.