Body Import/Export Addon for Blender 3.6.4

[xxpy02]

I use a V3.6.4 exactly

Are you using version 1.6.1 of the addon? Do you have any other exceptions aside that?
The addon assumes that the default shader for new materials is the Principled BSDF. If for some reason new materials get assigned a different shader it will break.
Check what shader is used by default when you add a new material to a new object (cube, uv sphere, etc).
If it is some other than the Principled BSDF, then it may have to do with some configuration that I am not aware of.