The following package was not found in...
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
dashgo_description/urdf/dashgobase/dashgobase.xacro
following file at this path.Are you sure you have the ros package that is for noetic? You may run into many weird issues if this package is actually intended for an earlier version of ros.