How do I get my game working in XDK?

OK, I really tried and I have no idea what I'm doing wrong. I followed both the tutorial for using the new XDK import and the Udemy course for exporting a mobile game (with XDK).

Everything seems to go fine until I get to the XDK emulator. When it should be showing the game, I end up with a black screen. The game works fine when playing it in browser from inside Construct 2.

Help?

From the discussions here :

and here :

Some black screen resolutions have been "It should work if you either turn off WKWebView or add the CorHttpd plugin."

That's all the info I have from searching. Black screen seems to be a regular occurence though and could have different reasons.