Error when call ns-render-mesh

[XinyueZ]

Traceback (most recent call last):
  File "/home/user/.local/bin/ns-render-mesh", line 8, in <module>
    sys.exit(entrypoint())
  File "/home/user/sdfstudio/scripts/render_mesh.py", line 257, in entrypoint
    tyro.cli(RenderTrajectory).main()
  File "/home/user/sdfstudio/scripts/render_mesh.py", line 242, in main
    _render_trajectory_video(
  File "/home/user/sdfstudio/scripts/render_mesh.py", line 108, in _render_trajectory_video
    vis.get_render_option().load_from_json("scripts/render.json")
AttributeError: 'NoneType' object has no attribute 'load_from_json'