Error: stack/package nxt_python not found
I have just installed Ubuntu 11.10, and installed ROS. Then I tried to setup ros_nxt http://www.ros.org/wiki/Robots/NXT/electric
To verify the setup, I run nxt_python, but got the following error.
$ rosrun nxt_python touch_sensor_test.py
[rospack] Error: stack/package nxt_python not found
I tried roscd and got the same error, but rosls works
$ rosls nxt_python
Desktop Downloads Music Public Videos
Documents examples.desktop Pictures Templates
$ roscd nxt_python
roscd: No such package/stack 'nxt_python'
any suggestion to debugging this problem?