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You say that the executable is in /devel/lib - I assume that you mean /home/andreas/catkin_ws/devel/lib? If so, the problem is that it's not in your path. Are you manually setting the ROS_PACKAGE_PATH, or doing so by sourcing a catkin-generated setup file?

You say that the executable is in /devel/lib - I assume that you mean /home/andreas/catkin_ws/devel/lib? If so, the problem is that it's not in your path. Are you manually setting the ROS_PACKAGE_PATH, or doing so by sourcing a catkin-generated setup file?

EDIT:

To address something that came up in the comments: You shouldn't need to source both ~/ros_catkin_ws/install_isolated/setup.bash and ~/catkin_ws/devel/setup.bash. Assuming that you had sourced ~/ros_catkin_ws/install_isolated/setup.bash when you first created the catkin workspace as indicated in the tutorial, in all subsequent terminals devel/setup.bash on its own is sufficient. See section 2.5 in the conceptual overview.