I tried out this code from the Isaac Sim Deep Dive video(Isaac Sim 2020: Deep Dive - YouTube at 23:38):
import numpy as np
from omni.isaac.dynamic_control import _dynamic_control
dc = _dynamic_control.acquire_dynamic_control_interface()
articulation = dc.get_articulation("/panda/")
joint_angles = [np.random.rand(9)*2-1]
But when I play the simulation, the arm just jitters and I receive an error saying that I have an expired or invalid articulation handle. I expected the arm to move slowly as it does in the demo. Why am I getting this error?