That's it, that's all clear to me. I know how to install an addon in Blender. Other addons I use work flawlessly. The problem is simply that Blender can't find the "bpy.ops.export_scene.gltf" according to the error message.
I read in another thread that the error also occurs in Blender's own gltf export and has nothing to do with the asobo exporter. There someone wrote that Blender caused problems because he did not install an addon as administrator, but started blender as admin. Supposedly that fixed the problem for him. so I also uninstalled everything, started it as Admin Blender and reinstalled the asobo exporter. The error is still there.
I also don't understand why Blender has a problem finding this one file. I have also installed blender 2.93 LTS again, there comes the same error
I read in another thread that the error also occurs in Blender's own gltf export and has nothing to do with the asobo exporter. There someone wrote that Blender caused problems because he did not install an addon as administrator, but started blender as admin. Supposedly that fixed the problem for him. so I also uninstalled everything, started it as Admin Blender and reinstalled the asobo exporter. The error is still there.
I also don't understand why Blender has a problem finding this one file. I have also installed blender 2.93 LTS again, there comes the same error