Invalid parameter when initializing #1
Description
I install ros melodic on ubuntu18.04 and compile oslsim according instructions. However, when i was running roslaunch oslsim main.launch control:=true, there existed an error as below:
$ roslaunch oslsim main.launch control:=true
... logging to /home/user/.ros/log/7cc08b3c-b647-11ec-8165-30d042e761b4/dell-3175.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.
Invalid parameter "robot_ns"
when instantiating macro: dc_motor (/home/user/catkin_ws/src/gazebo_ros_motors/xacro/dc_motor.xacro)
in file: /home/user/catkin_ws/src/oslsim/urdf/oslsim.xacro
RLException: Invalid <param> tag: Cannot load command parameter [robot_description]: command [['/opt/ros/melodic/lib/xacro/xacro', '/home/user/catkin_ws/src/oslsim/urdf/oslsim.xacro']] returned with code [2].
Param xml is <param command="$(find xacro)/xacro '$(find oslsim)/urdf/oslsim.xacro'" name="robot_description"/>
The traceback for the exception was written to the log file
It seems that dc_motor.xacro in gazebo does not support robot_ns. How can I figure it out?