i can not start the manipulation pipeline.why? [closed]

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i want to use the pack of "pr2_pick_and_place_demos" to develop my own demos.but i can not start the manipulation pipeline.i type"export ROBOT=sim roslaunch pr2_interactive_manipulation pr2_interactive_manipulation_robot sim:=true "in the terminal. response is that "cannot locate [pr2_interactive_manipulation_robot] in package [pr2_interactive_manipulation] ".someone tell me the reason ?how to solve it?thank you very much!