I firstly install the bhand ros package ,I failed to run the node

[hoppss]

I am a new learner. could you give me some help ?
I think I install the package correctly. there is 3 bhand package in roapack list.
when i run "roslaunch bhand_controller bhand_controller.launch", there is a mistake prompt "core service [/rosout] found
ERROR: cannot launch node of type [bhand_controller/bhand_node.py]: can't locate node [bhand_node.py] in package [bhand_controller]
"
I install the pcan dependencies. there are some pcan* file in /dev/
so could you give me some advice ?
Thank you .

[hoppss]

There are some tips to install the bh8-282 ros package.
sudo apt-get install swig libpopt-dev
you need to install cob_extern(libpcan and peak-driver7.15.2) firstly. I dont konw whether peak-driver 8.x can install successfully.
After catkin_make, maybe you cannot call the action service, you need to cmake . && make in the "src/barrett_hand/bhand_controller/"