Error reported when loading the ply file

[leooo66]

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The obj file can load normally, but the ply file will report an error code：

    target_entity = scene.add_entity(
        gs.morphs.Mesh(
            file="urdf/3763/point_sample/sample-points-all-pts-nor-rgba-10000.ply",
            #file="meshes/axis.obj",
            pos=(0.5, 0, 0),
        ),
        surface=gs.surfaces.Default(color=(1, 0.5, 0.5, 1)),
    )

error：
(genesis) (base) jun@Jun:~/Genesis$ /home/jun/miniconda3/envs/genesis/bin/python /home/jun/Genesis/examples/rigid/control_franka.py
[Genesis] [21:35:04] [INFO] ╭─────────────────────────────────────────────────────────────────────────────────────╮
[Genesis] [21:35:04] [INFO] │┈┉┈┉┈┉┈┉┈┉┈┉┈┉┈┉┈┉┈┉┈┉┈┉┈┉┈┉┈┉┈┉┈┉┈┉┈┉ Genesis ┈┉┈┉┈┉┈┉┈┉┈┉┈┉┈┉┈┉┈┉┈┉┈┉┈┉┈┉┈┉┈┉┈┉┈┉┈┉│
[Genesis] [21:35:04] [INFO] ╰─────────────────────────────────────────────────────────────────────────────────────╯
[Genesis] [21:35:04] [INFO] Running on [NVIDIA GeForce RTX 4060 Laptop GPU] with backend gs.cuda. Device memory: 7.72 GB.
[Genesis] [21:35:04] [INFO] 🚀 Genesis initialized. 🔖 version: 0.2.1, 🌱 seed: None, 📏 precision: '32', 🐛 debug: False, 🎨 theme: 'dark'.
[Genesis] [21:35:04] [INFO] Scene <05fa8ac> created.
[Genesis] [21:35:04] [INFO] Adding <gs.RigidEntity>. idx: 0, uid: <0b6f158>, morph: <gs.morphs.Plane>, material: <gs.materials.Rigid>.
[Genesis] [21:35:04] [INFO] Adding <gs.RigidEntity>. idx: 1, uid: <104be94>, morph: <gs.morphs.MJCF(file='/home/jun/Genesis/genesis/assets/xml/franka_emika_panda/panda.xml')>, material: <gs.materials.Rigid>.
[Genesis] [21:35:04] [INFO] Adding <gs.RigidEntity>. idx: 2, uid: <3627dbd>, morph: <gs.morphs.Mesh(file='/home/jun/Genesis/genesis/assets/urdf/3763/point_sample/sample-points-all-pts-nor-rgba-10000.ply')>, material: <gs.materials.Rigid>.
Traceback (most recent call last):
  File "/home/jun/Genesis/examples/rigid/control_franka.py", line 132, in <module>
    main()
  File "/home/jun/Genesis/examples/rigid/control_franka.py", line 41, in main
    target_entity = scene.add_entity(
  File "/home/jun/Genesis/genesis/utils/misc.py", line 38, in wrapper
    return method(self, *args, **kwargs)
  File "/home/jun/Genesis/genesis/engine/scene.py", line 359, in add_entity
    entity = self._sim._add_entity(morph, material, surface, visualize_contact)
  File "/home/jun/Genesis/genesis/engine/simulator.py", line 134, in _add_entity
    entity = self.rigid_solver.add_entity(self.n_entities, material, morph, surface, visualize_contact)
  File "/home/jun/Genesis/genesis/engine/solvers/rigid/rigid_solver_decomp.py", line 64, in add_entity
    entity = entity_class(
  File "/home/jun/Genesis/genesis/engine/entities/rigid_entity/rigid_entity.py", line 68, in __init__
    self._load_model()
  File "/home/jun/Genesis/genesis/engine/entities/rigid_entity/rigid_entity.py", line 75, in _load_model
    self._load_mesh(self._morph, self._surface)
  File "/home/jun/Genesis/genesis/engine/entities/rigid_entity/rigid_entity.py", line 246, in _load_mesh
    vmeshes, meshes = mu.parse_visual_and_col_mesh(morph, surface)
  File "/home/jun/Genesis/genesis/utils/mesh.py", line 223, in parse_visual_and_col_mesh
    vms = gs.Mesh.from_morph_surface(morph, surface)
  File "/home/jun/Genesis/genesis/engine/mesh.py", line 313, in from_morph_surface
    meshes = mu.parse_mesh_trimesh(morph.file, morph.group_by_material, morph.scale, surface)
  File "/home/jun/Genesis/genesis/utils/mesh.py", line 286, in parse_mesh_trimesh
    meshes.append(gs.Mesh.from_trimesh(mesh=mesh, scale=scale, surface=surface))
  File "/home/jun/Genesis/genesis/engine/mesh.py", line 215, in from_trimesh
    if mesh.visual.defined:
AttributeError: 'VertexColor' object has no attribute 'defined'