RuntimeError: Handle cam_over_shoulder_left_mask does not exist.

[xiangbaihan]

when I running "python task_builder.py",I got those error: ############################################### Traceback (most recent call last): File "task_builder.py", line 289, in scene = Scene(pr, robot, obs_config) File "/home/xbh/RLBench/tools/../rlbench/backend/scene.py", line 50, in init self._cam_over_shoulder_left_mask = VisionSensor( File "/home/xbh/.local/lib/python3.8/site-packages/pyrep/objects/vision_sensor.py", line 14, in init super().init(name_or_handle) File "/home/xbh/.local/lib/python3.8/site-packages/pyrep/objects/object.py", line 24, in init self._handle = sim.simGetObjectHandle(name_or_handle) File "/home/xbh/.local/lib/python3.8/site-packages/pyrep/backend/sim.py", line 94, in simGetObjectHandle raise RuntimeError('Handle %s does not exist.' % objectName) RuntimeError: Handle cam_over_shoulder_left_mask does not exist. QObject::~QObject: Timers cannot be stopped from another thread QMutex: destroying locked mutex ############################################# what should I do?