Looks like I might need to update the chapter. 
This problem seems to be fixed with Xcode 11.4.
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Hello
Any news?
I tried to run all the commands from terminal, cleanmymac, onyx. etc
But XCode 11.1 crashes with Catalina 10.15. I have to use that version of Xcode. (11.1)
How can I solve it?
With Xcode 11.4.1 and Catalina 10.15.4 no problems here anymore.
You could always use the “organized assets” export script. (I prefer this nowadays).
That used to work all the time.
The root of the problem is in the “.hyperesources” extension on the export folder. If you change the folder name as well as corresponding references to the new name in the .html file and *_hype_generated_script.js file, then Xcode will not crash with it. (Organized assets doesn’t use a .hyperesources folder, so it is a good fix too as @Djon mentions ).
This has been fixed by Apple in Xcode 11.4.
There’s also a fix for it that will apply to older Xcode versions in the upcoming beta of Hype. Send me a DM if you’d like to join the beta program.