Gazebo not working with ROSS because of lxml

[HebiMigrator]

I am having trouble getting the hebi gazebo tutorial running with ROS. I have followed the tutorial on [github][https://github.com/HebiRobotics/hebi_gazebo] and also installed hebi_description and hebi_cpp_api_ros_examples in my workspace but get the following error when I try running :

roslaunch hebi_gazebo arm_simulation.launch arm_type:=A-2085-06

And the error...

Traceback (most recent call last):
  File "/home/schuler/catkin_ws/src/hebi_description/scripts/urdf_generator.py", line 10, in <module>
    from lxml import etree as ET
ModuleNotFoundError: No module named 'lxml'
RLException: Invalid <param> tag: Cannot load command parameter [robot_description]: command [['/home/schuler/catkin_ws/src/hebi_description/scripts/hrdf_convert', '/home/schuler/catkin_ws/src/hebi_cpp_api_examples/config/A-2085-06_params.yaml']] returned with code [255]. 

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

I tried installing lxml manually and that didn't fix the issue.

Originally posted by tkschuler on forums.hebi.us » Tue Feb 02, 2021 2:35 pm

[HebiMigrator]

I needed to do pip3 install lxml instead of pip install lxml and now it is working.

Originally posted by tkschuler on forums.hebi.us » Tue Feb 02, 2021 5:07 pm