Github Pages is throwing 404 for some files

can someone help me?
My Page (web-component-designer-simple-demo) is throwing 404 for some files, but the files are in the pages branch:
GitHub - node-projects/web-component-designer-simple-demo at gh-pages
for example:

I somewhere read that path could be to long. Is that an issue?

I’ve another project where the same config/layout/filenames work: web-component-designer-demo

This was the issue: How to disable jekyll build