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Traceback (most recent call last): File "/home/jetson-orin1/noetic_ws/src/nlp2/src/vision_test.py", line 23, in listener() File "/home/jetson-orin1/noetic_ws/src/nlp2/src/vision_test.py", line 18, in listener rospy.Subscriber("/zed2i/zed_node/obj_det/objects", sl.Objects, callback) File "/opt/ros/noetic/lib/python3/dist-packages/rospy/topics.py", line 563, in __init__ super(Subscriber, self).__init__(name, data_class, Registration.SUB) File "/opt/ros/noetic/lib/python3/dist-packages/rospy/topics.py", line 144, in __init__ raise ValueError("data_class [%s] is not a message data class"?ta_class.__class__.__name__) ValueError: data_class [type] is not a message data class