No change to texture

Hello ! The tool looks really cool, though if I try a non material glb mesh I have an error.
If I try a empty texture material mesh, it just generates blank textures.
If I try with a already textured mesh (albedo only), it generates blank other textures and leaves the existing one as is :(

I stricly followed the readme so I don't understand what I'm doing wrong.

Here is what I get with a mesh having a PrincipleBSDF material with no textures :