Resource not found: xacro
I am a beginner at using ROS.
I just following the "Building a Visual Robot Model with URDF from Scratch"
Already:
created tutorial_ws/src
downloaded and copied the urdf_tutorial to src folder
cd tutorial_ws
catkin_make
source devel/setup.bash
roslaunch urdf_tutorial display.launch model:='$(find urdf_tutorial)/urdf/01-myfirst.urdf'
However, I have an error: Resource not found: xacro
Do I miss any steps? Thank you in advance for your help!