Traceback (most recent call last):


 "/usr/local/bin/papermill", line 8, in <module>

sys.exit(papermill())


 "/usr/local/lib/python3.7/site-packages/click/core.py", line 829, in __call__

return self.main(*args, **kwargs)


 "/usr/local/lib/python3.7/site-packages/click/core.py", line 782, in main

rv = self.invoke(ctx)


 "/usr/local/lib/python3.7/site-packages/click/core.py", line 1066, in invoke

return ctx.invoke(self.callback, **ctx.params)


 "/usr/local/lib/python3.7/site-packages/click/core.py", line 610, in invoke

return callback(*args, **kwargs)


 "/usr/local/lib/python3.7/site-packages/click/decorators.py", line 21, in new_func

return f(get_current_context(), *args, **kwargs)


 "/usr/local/lib/python3.7/site-packages/papermill/cli.py", line 228, in papermill

parameters_final.update(read_yaml_file(files))
TypeError: 'NoneType' object is not iterable

Traceback (most recent call last):


 "/home/kim/3dDev/blender-2.81a-linux-glibc217-x86_64/2.81/scripts/addons/io_scene_gltf2/__init__.py", line 923, in execute

return self.import_gltf2(context)


 "/home/kim/3dDev/blender-2.81a-linux-glibc217-x86_64/2.81/scripts/addons/io_scene_gltf2/__init__.py", line 937, in import_gltf2

if self.unit_import(path, import_settings) == {'FINISHED'}:


 "/home/kim/3dDev/blender-2.81a-linux-glibc217-x86_64/2.81/scripts/addons/io_scene_gltf2/__init__.py", line 960, in unit_import

BlenderGlTF.create(self.gltf_importer)


 "/home/kim/3dDev/blender-2.81a-linux-glibc217-x86_64/2.81/scripts/addons/io_scene_gltf2/blender/imp/gltf2_blender_gltf.py", line 30, in create

BlenderScene.create(gltf)


 "/home/kim/3dDev/blender-2.81a-linux-glibc217-x86_64/2.81/scripts/addons/io_scene_gltf2/blender/imp/gltf2_blender_scene.py", line 60, in create

BlenderScene.set_active_object(gltf)


 "/home/kim/3dDev/blender-2.81a-linux-glibc217-x86_64/2.81/scripts/addons/io_scene_gltf2/blender/imp/gltf2_blender_scene.py", line 88, in set_active_object

vnode = gltf.vnodes[pyscene.nodes[0]]
TypeError: 'NoneType' object is not subscriptable
