rosrun xacro xacro.py nao_robot_v4_structure.urdf.xacro fails

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Hi,

The other day, I send following question to University of Freiburg who made this package, and got an answer. I hope you can benefit from this as well if you have the same problem.

I'm also using NAO robot too ( http://www.youtube.com/watch?v=9KfqmX... ), and try to use nao_description package, but I have following error. If you know how to fix this, please let me know.

tsuji@leda:~/ros/electric/alufr-ros-pkg/nao_common/nao_description/urdf$
rosrun xacro xacro.py nao_robot_v4_structure.urdf.xacro  >
nao_structure.urdf

Traceback (most recent call last):
 File "/opt/ros/electric/stacks/xacro/xacro.py", line 35, in <module>
   xacro.main()
 File "/opt/ros/electric/stacks/xacro/src/xacro.py", line 558, in main
   eval_self_contained(doc)
 File "/opt/ros/electric/stacks/xacro/src/xacro.py", line 499, in
eval_self_contained
   eval_all(doc.documentElement, macros, symbols)
 File "/opt/ros/electric/stacks/xacro/src/xacro.py", line 483, in eval_all
   result = eval_text(at[1], symbols)
 File "/opt/ros/electric/stacks/xacro/src/xacro.py", line 402, in eval_text
   results.append(handle_expr(lex.next()[1][2:-1]))
 File "/opt/ros/electric/stacks/xacro/src/xacro.py", line 390, in handle_expr
   return eval_expr(lex, symbols)
 File "/opt/ros/electric/stacks/xacro/src/xacro.py", line 364, in eval_expr
   result = eval_term(lex, symbols)
 File "/opt/ros/electric/stacks/xacro/src/xacro.py", line 339, in eval_term
   result = eval_factor(lex, symbols)
 File "/opt/ros/electric/stacks/xacro/src/xacro.py", line 320, in eval_factor
   return neg * eval_lit(lex, symbols)
 File "/opt/ros/electric/stacks/xacro/src/xacro.py", line 298, in eval_lit
   raise XacroException("Property wasn't defined: %s" % str(ex))
xacro.XacroException: Property wasn't defined: u'pi_2'

And I got following answer.

The file is not meant to be used stand-alone because it includes only the structure without visualization. You need to run "rosrun xacro xacro.py nao_robot_v4.urdf.xacro"

Or directly start the state_publisher as well with the launch file with launch/nao_v4_publisher.launch.