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The short answer is remove everything under the ros_catkin_ws directory and rerun the wstool command to install a new catkin build tree.

cd ros_catkin_sw rm -rf * wstool init -j8 src http://packages.ros.org/web/rosinstall/generate/raw/groovy/ros_comm

Then proceed with the standard build process.

The short answer is remove everything under the ros_catkin_ws directory and rerun the wstool command to install a new catkin build tree.

cd ros_catkin_sw ros_catkin_sw

rm -rf * *

wstool init -j8 src http://packages.ros.org/web/rosinstall/generate/raw/groovy/ros_comm

Then proceed with the standard build process.