shadow-robot/sr-visualization

Error in grasp controller.

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Hello,
I am trying rqt plugins in simulation.
While trying to save the grasp in grasp controller rqt plugin following error occurs.

sr_visualization/sr_gui_grasp_controller/src/sr_gui_grasp_controller/grasp_controller.py", line 258, in accept
    self._target_mutex.acquire()
AttributeError: 'GraspSaver' object has no attribute '_target_mutex'