rqt_publisher报错/publisher_widget.py“, line 105, in _update_thread_run

rqt_publisher报错/publisher_widget.py", line 105, in _update_thread_run

Traceback (most recent call last):
  File "/opt/ros/melodic/lib/python2.7/dist-packages/rqt_publisher/publisher_widget.py", line 105, in _update_thread_run
    message_class = roslib.message.get_message_class(base_type_str)
  File "/opt/ros/melodic/lib/python2.7/dist-packages/roslib/message.py", line 112, in get_message_class
    cls = genpy.message.get_message_class(message_type, reload_on_error=reload_on_error)
  File "/opt/ros/melodic/lib/python2.7/dist-packages/genpy/message.py", line 697, in get_message_class
    cls = _get_message_or_service_class('msg', message_type, reload_on_error=reload_on_error)
  File "/opt/ros/melodic/lib/python2.7/dist-packages/genpy/message.py", line 644, in _get_message_or_service_class
    pypkg = __import__('%s.%s

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