Could not launch node

[subhaya]

Hi, I installed this package from sudo apt-get install ros-indigo-aruco-mapping. I am trying to find the location of the robot from a usb camera but when I create the launch file and run it. It shows the following error. ERROR: cannot launch node of type [aruco_mapping/aruco_mapping]: can't locate node [aruco_mapping] in package [aruco_mapping]

[zachkendrick]

you need to source your bash.setup file in the devel directory of your catkin workspace first:

$ cd ~/catkinws $ source devel/setup.bash

[blutjens]

Assure that $ rospack list lists the package to your aruco_mapping installation path.