The following package was not found in...

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plain dump of the error message:

 yan@yan:~/catkin_ws/src$ roslaunch dashgo_description dashgo_description.launch
... logging to /home/yan/.ros/log/4727ce58-fb40-11eb-8546-2f5a26d182fd/roslaunch-yan-48800.log
Checking log directory for disk usage. This may take a while.
Press Ctrl-C to interrupt
Done checking log file disk usage. Usage is <1GB.

Resource not found: The following package was not found in <arg name="urdf_file" default="$(find xacro)/xacro.py $(find dashgo_description)/urdf/dashgobase/dashgobase.xacro"/>: xacro
ROS path [0]=/opt/ros/noetic/share/ros
ROS path [1]=/home/yan/dashgo_ws/src
ROS path [2]=/home/yan/catkin_ws/src
ROS path [3]=/opt/ros/noetic/share
The traceback for the exception was written to the log file