Error message does not show relevant file

[Imaduddin A Majid]

I have a xacro file that includes the other 3 xacro files. One of the included xacro files has an error but the error message could not show which file has the error.

Here is the main xacro file (robot.xacro)

<?xml version="1.0" ?>
<robot xmlns:xacro="http://ros.org/wiki/xacro" name="smart_robot">

. . .
  <xacro:include filename="$(find robot_description)/urdf/robot.base.xacro" />
  <xacro:include filename="$(find robot_description)/urdf/robot.gazebo.xacro" />
  <xacro:include filename="$(find robot_description)/urdf/sensors/rplidar.urdf.xacro" />
 . . . 
 </robot>

When I run the xacro command via rosrun, this error message has shown on the log

$ rosrun xacro xacro robot.xacro 
XML parsing error: not well-formed (invalid token): line 5, column 2
when processing file: robot.xacro

Check that:
 - Your XML is well-formed
 - You have the xacro xmlns declaration: xmlns:xacro="http://www.ros.org/wiki/xacro"

Adding the verbosity level to the maximum also didn't help.

$ rosrun xacro xacro --verbosity=4 robot.xacro 
set visualize_sensor: $(arg visualize_sensor) (robot.xacro)
set use_3d_lidar: $(arg use_3d_lidar) (robot.xacro)
set use_arm: $(arg use_arm) (robot.xacro)
set use_stereo: $(arg use_stereo) (robot.xacro)
set tower_base: 0.248 (robot.xacro)
set gpu: $(arg gpu) (robot.xacro)
XML parsing error: not well-formed (invalid token): line 5, column 2
when processing file: robot.xacro

Check that:
 - Your XML is well-formed
 - You have the xacro xmlns declaration: xmlns:xacro="http://www.ros.org/wiki/xacro"

The line 5, column 2 in robot.xacro is this line. Which has no error.

<xacro:arg name="use_3d_lidar" default="false"/>

Even, removing the line doesn't change the error message. Suddenly, I realize the error was in robot.gazebo.xacro file which is included in robot.xacro file. Thus, It will be helpful if we can get relevant file path for the error message so we can fix the problem quicker.

Thank you.

[Imaduddin A Majid]

Thank you for fixing the issue @rhaschke