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Hi!

There are two different possibilities than can cause this error.

1. You have not installed the control_toolbox package. To do this the following command should be enough.

   sudo apt-get install ros-indigo-control-toolbox

2. If this is not the case and you already have installed it. Then there is a problem with the sourcing of that package. You have to make sure that the route where that package is installed is in the $ROS_PACKAGE_PATH. Just do a echo $ROS_PACKAGE_PATH to see the paths in your ROS_PACKAGE_PATH.

I hope this helps!