roslaunch rbx2_tasks fake_turtlebot.launch

[Cactus Jack]

I am trying to run  roslaunch rbx2_tasks fake_turtlebot.launch from ROS examples vol. 2 with Indigo.  I keep getting :
  roslaunch rbx2_tasks fake_turtlebot.launch
... logging to /home/brent/.ros/log/4e5f85aa-c79a-11e6-9d38-00123fafd8db/roslaunch-brent-Dell-DM051-28581.log
Checking log directory for disk usage. This may take awhile.
Press Ctrl-C to interrupt
Done checking log file disk usage. Usage is <1GB.

Traceback (most recent call last):
  File "/opt/ros/indigo/share/xacro/xacro.py", line 60, in <module>
    import xacro
  File "/opt/ros/indigo/lib/python2.7/dist-packages/xacro/__init__.py", line 45, in <module>
    from roslaunch import substitution_args
  File "/opt/ros/indigo/lib/python2.7/dist-packages/roslaunch/__init__.py", line 48, in <module>
    import rospkg
ImportError: No module named rospkg
Invalid <param> tag: Cannot load command parameter [robot_description]: command [/opt/ros/indigo/share/xacro/xacro.py '/home/brent/catkin_ws/src/rbx1/rbx1_description/urdf/turtlebot.urdf.xacro'] returned with code [1].

Param xml is <param command="$(arg urdf_file)" name="robot_description"/>
The traceback for the exception was written to the log file

Any help would be appreciated,
Thank you,
Cactus

[Patrick Goebel]

Hi Cactus,

Sounds like your PYTHONPATH variable is not being set properly. What do
you see if you run the command:

$ env | grep PYTHONPATH

--patrick

[B Lamb]

Patrick,

This what I get:

PYTHONPATH=/home/brent/catkin_ws/devel/lib/python2.7/dist-packages:/opt/ros/indigo/lib/python2.7/dist-packages

Thank you for your help!

Cactus

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[Cactus Jack]

Patrick this is what I get:

PYTHONPATH=/home/brent/catkin_ws/devel/lib/python2.7/dist-packages:/opt/ros/indigo/lib/python2.7/dist-packages

Thank you for your help,
Cactus

[Patrick Goebel]

That looks OK.  So something weird is going on.  Are you running Python3 as your default Python interpreter instead of Python2?

I Googled "ImportError: No module named rospkg" and there were a number of suggestions on answers.ros.org.  One of them was to install python-rospkg manually as follows:

$ sudo apt-get install python-rospkg

--patrick

[B Lamb]

I ran sudo apt-get install python-rospkg again, and it still gives me the same error.  I have Python2 installed.

Cactus

>   File "/opt/ros/indigo/share/xacro/ xacro.py", line 60, in <module>
>     import xacro
>   File
> "/opt/ros/indigo/lib/python2. 7/dist-packages/xacro/__init__ .py", line

> 45, in <module>
>     from roslaunch import substitution_args
>   File

> "/opt/ros/indigo/lib/python2. 7/dist-packages/roslaunch/__ init__.py",

> line 48, in <module>
>     import rospkg
> ImportError: No module named rospkg
> Invalid <param> tag: Cannot load command parameter
> [robot_description]: command [/opt/ros/indigo/share/xacro/ xacro.py
> '/home/brent/catkin_ws/src/ rbx1/rbx1_description/urdf/ turtlebot.urdf.xacro']
> returned with code [1].
>
> Param xml is <param command="$(arg urdf_file)" name="robot_description"/>
> The traceback for the exception was written to the log file
>
> Any help would be appreciated,
> Thank you,
> Cactus

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[Patrick Goebel]

OK, but what version do you see when you run:

$ python --version

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[B Lamb]

Patrick,  it shows Python 2.7.13

Cactus

[Patrick Goebel]

Weirder and weirder.  Try adding the /usr space Python packages to your path:

$ export PYTHONPATH=/usr/lib/python2.7/dist-packages:$PYTHONPATH

This isn't necessary on my machine (Ubuntu 14.04, ROS Indigo), but it might be worth a try.

--patrick

[B Lamb]

I still get the same error.

Cactus

[Patrick Goebel]

Hmmm.  Let's go back to your Python version.  I have 2.7.6 under Ubuntu 14.04 and you have 2.7.13.  Are you not running Ubuntu 14.04?  Or did you install Python from source?

--patrick

[B Lamb]

I am running Ubuntu 14.04.  I did upgrade Python to 2.7.13

Cactus

[Patrick Goebel]

That might be a problem.  Try the following command to see if you get the same error:

$ roslaunch turtlebot_rviz_launchers view_model.launch

--p

[B Lamb]

This is what I get:

brent@brent-Dell-DM051:~$ roslaunch turtlebot_rviz_launchers view_model.launch
... logging to /home/brent/.ros/log/d3a5806a-c863-11e6-84d9-00123fafd8db/roslaunch-brent-Dell-DM051-2672.log

Checking log directory for disk usage. This may take awhile.
Press Ctrl-C to interrupt
Done checking log file disk usage. Usage is <1GB.

Traceback (most recent call last):

  File "/opt/ros/indigo/share/xacro/xacro.py", line 60, in <module>
    import xacro
  File "/opt/ros/indigo/lib/python2.7/dist-packages/xacro/__init__.py", line 45, in <module>
    from roslaunch import substitution_args
  File "/opt/ros/indigo/lib/python2.7/dist-packages/roslaunch/__init__.py", line 48, in <module>

    import rospkg
ImportError: No module named rospkg

while processing /opt/ros/indigo/share/turtlebot_bringup/launch/includes/robot.launch.xml:
while processing /opt/ros/indigo/share/turtlebot_bringup/launch/includes/description.launch.xml:
Invalid <param> tag: Cannot load command parameter [robot_description]: command [/opt/ros/indigo/share/xacro/xacro.py '/opt/ros/indigo/share/turtlebot_description/robots/kobuki_hexagons_asus_xtion_pro.urdf.xacro'] returned with code [1].

Param xml is <param command="$(arg urdf_file)" name="robot_description"/>

The traceback for the exception was written to the log file.
 

Brent

[Patrick Goebel]

Seems the problem is generic then and is not related to the rbx1 or rbx2 code.  So you're probably going to have to go back to Python 2.7.6, but for the definitive answer, best check on answers.ros.org.

--patrick