Grasping with Fetch - error

I am at 6.Grasping / Detecting the graspable object course.
when I tried (roslaunch fetch_gazebo_demo move_torso.launch),
error happened as I attached.

Hello @hki,

Well, I believe that error has nothing to do with the move torso script. The error that appears in the screenshot indicates that it’s not finding the executable basic_grasping_perception from the simple_grasping package. Maybe you didn’t compile the simple_grasping package?