But I can’t found what’s the problem. Also I reached the author / developer and there’s no answer. Can you help me to fork that repo to find the cause an error and try to fix it?
Try running jekyll build --verbose and maybe it will show something more obvious.
it is using a layout to compress the html - while a neat idea I had trouble with that when I played with it, I would try disabling that in the default layout front matter - just remove it and see if it helps.