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It looks to me as if your $ROS_PACKAGE_PATH environment variable is set wrong. ROS should be looking in /home/master/catkin_ws/devel, not the build directory for your executables.

Did you remember to source the devel/setup.bash file to add the catkin workspace to your ROS_PACKAGE_PATH? More info at the bottom of this tutorial.

$ source devel/setup.bash

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