name 'xacro' is not defined

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Hi,

when I'm trying to launch my simulation I get an error and when I execute the command in the error message I get the following output:

name 'xacro' is not defined 
when evaluating expression 'xacro.load_yaml(visual_parameters_file)' 
when evaluating expression 'config_visual_parameters['mesh_files']'
when instantiating macro: read_model_data 
(/root/ur_driver/install/ur_description/share/ur_description/urdf/inc/ur_common.xacro)
 instantiated from: ur_robot (/root/ur_driver/install/ur_description/share/ur_description/urdf/ur_macro.xacro)
 in file: /root/ur_driver/install/ur_description/share/ur_description/urdf/ur.urdf.xacro

Yesterday it worked fine. I tried to rebuild the docker container and tried to reinstall xacro with

apt-get remove ros-foxy-xacro
apt-get install ros-foxy-xacro

I'm currently developing in a docker container with ubuntu 20.04 and ROS foxy. I'm working with the UR ROS2 Driver foxy branch and try to launch with the following command:

ros2 launch ur_bringup ur_control.launch.py ur_type:=ur5e robot_ip:=yyy.yyy.yyy.yyy use_fake_hardware:=true launch_rviz:=false