Khronos glTF Viewer sample fails to load resources

[cx20]

I tried the Khronos glTF Viewer sample.
However, it seems that some resources are currently missing and an error occurs.

https://cx20.github.io/gltf-test/examples/khronos-gltf-rv/index.html?model=Duck&scale=1

Previously the sample worked, so I need to find out the correct resource location.