My ROS system is ROS2 foxy, but there was an error compiling ROS bridge on Ubuntu 20. I don't know how to solve it

[xoxclouds]

Starting >>> carla_msgs Starting >>> ros_compatibility Starting >>> carla_common
Starting >>> carla_ros_scenario_runner_types
Starting >>> carla_waypoint_types Starting >>> carla_twist_to_control
Starting >>> rqt_carla_control
--- stderr: carla_msgs
CMake Error at /opt/ros/foxy/share/rosidl_adapter/cmake/rosidl_adapt_interfaces.cmake:60 (message): execute_process(/home/yrj/anaconda3/bin/python3 -m rosidl_adapter --package-name carla_msgs --arguments-file /home/yrj/carla-ros2-bridge/build/carla_msgs/rosidl_adapterargumentscarla_msgs.json --output-dir /home/yrj/carla-ros2-bridge/build/carla_msgs/rosidl_adapter/carla_msgs --output-file /home/yrj/carla-ros2-bridge/build/carla_msgs/rosidl_adapter/carla_msgs.idls) returned error code 1:

AttributeError processing template 'msg.idl.em'

Traceback (most recent call last):

File "/opt/ros/foxy/lib/python3.8/site-packages/rosidl_adapter/resource/__init__.py", line 51, in evaluate_template
  em.BUFFERED_OPT: True,

AttributeError: module 'em' has no attribute 'BUFFERED_OPT'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):

File "/home/yrj/anaconda3/lib/python3.7/runpy.py", line 193, in _run_module_as_main
  "__main__", mod_spec)
File "/home/yrj/anaconda3/lib/python3.7/runpy.py", line 85, in _run_code
  exec(code, run_globals)
File "/opt/ros/foxy/lib/python3.8/site-packages/rosidl_adapter/__main__.py", line 19, in <module>
  sys.exit(main())
File "/opt/ros/foxy/lib/python3.8/site-packages/rosidl_adapter/main.py", line 55, in main
  pathlib.Path(relative_path), output_dir)
File "/opt/ros/foxy/lib/python3.8/site-packages/rosidl_adapter/__init__.py", line 20, in convert_to_idl
  package_dir, package_name, interface_file, output_dir / 'msg')
File "/opt/ros/foxy/lib/python3.8/site-packages/rosidl_adapter/msg/__init__.py", line 39, in convert_msg_to_idl
  expand_template('msg.idl.em', data, output_file, encoding='iso-8859-1')
File "/opt/ros/foxy/lib/python3.8/site-packages/rosidl_adapter/resource/__init__.py", line 23, in expand_template
  content = evaluate_template(template_name, data)
File "/opt/ros/foxy/lib/python3.8/site-packages/rosidl_adapter/resource/__init__.py", line 69, in evaluate_template
  _interpreter.shutdown()

AttributeError: 'NoneType' object has no attribute 'shutdown'

Call Stack (most recent call first): /opt/ros/foxy/share/rosidl_cmake/cmake/rosidl_generate_interfaces.cmake:130 (rosidl_adapt_interfaces) CMakeLists.txt:79 (rosidl_generate_interfaces)

---

Failed <<< carla_msgs [1.27s, exited with code 1] Aborted <<< carla_ros_scenario_runner_types [1.05s] Aborted <<< carla_waypoint_types [0.98s] Aborted <<< carla_common [1.27s]
Aborted <<< carla_twist_to_control [1.07s] Aborted <<< ros_compatibility [1.36s] Aborted <<< rqt_carla_control [1.00s]

Summary: 0 packages finished [2.82s] 1 package failed: carla_msgs 6 packages aborted: carla_common carla_ros_scenario_runner_types carla_twist_to_control carla_waypoint_types ros_compatibility rqt_carla_control 3 packages had stderr output: carla_msgs carla_ros_scenario_runner_types carla_waypoint_types 12 packages not processed

[FelipeGdM]

Have you installed all dependencies? This error may be caused by a missing dependency

You may try

rosdep install --from-paths src --ignore-src -r -y

Then try to compile the project again with

colcon build --cmake-clean-first

The flag --cmake-clean-first is needed because some intermediary object files may be broken due to missing dependencies, so it's better to attempt a fresh start

[zhangjiatao]

I also encountered this issue, and the compilation error occurred on Python 3.11. I was able to resolve it by recompiling on Python 3.8.

[xoxclouds]

Thank you for your feedback. I have already resolved this issue on my end.

[FelipeGdM]

@xoxclouds can you post the solution? It may be useful for other people in the future

[xoxclouds]

@FelipeGdM My ubuntu system crashed. I reinstalled ubuntu and compiled again and there was no problem. I may not be able to provide much help, I'm very sorry.

[is-whale]

是否安装了所有依赖项？此错误可能是由缺少依赖项引起的

你可以试试

rosdep install --from-paths src --ignore-src -r -y

然后尝试再次编译项目

colcon build --cmake-clean-first

该标志是必需的，因为某些中间对象文件可能会由于缺少依赖项而损坏，因此最好尝试重新开始--cmake-clean-first

oh ! I love U so much!!!

[JiBingdong]

@xoxclouds can you post the solution? It may be useful for other people in the future

I also encountered this issue, do you resolved this issue? PS: i try your answer in the top, but it does not work on my system.

[JiBingdong]

@xoxclouds can you post the solution? It may be useful for other people in the future

I also encountered this issue, do you resolved this issue? PS: i try your answer in the top, but it does not work on my system. I have already resolved this issue on my end.