Question

Hello everyone,

I am new to ros and just built this ros on macOS and tried the ros demo.

The cpp talker works well but when I tried to run the demon

ros2 run demo_nodes_py listener

The error are shown as

Traceback (most recent call last):
  File "/Users/weizhaoli/ROS/ros2_humble/install/demo_nodes_py/lib/demo_nodes_py/listener", line 33, in <module>
    sys.exit(load_entry_point('demo-nodes-py', 'console_scripts', 'listener')())
  File "/Users/weizhaoli/ROS/ros2_humble/install/demo_nodes_py/lib/demo_nodes_py/listener", line 25, in importlib_load_entry_point
    return next(matches).load()
  File "/usr/local/Cellar/python@3.10/3.10.6_2/Frameworks/Python.framework/Versions/3.10/lib/python3.10/importlib/metadata/__init__.py", line 171, in load
    module = import_module(match.group('module'))
  File "/usr/local/Cellar/python@3.10/3.10.6_2/Frameworks/Python.framework/Versions/3.10/lib/python3.10/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 688, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 883, in exec_module
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "/Users/weizhaoli/ROS/ros2_humble/build/demo_nodes_py/demo_nodes_py/topics/listener.py", line 17, in <module>
    import rclpy
  File "/Users/weizhaoli/ROS/ros2_humble/install/rclpy/lib/python3.7/site-packages/rclpy/__init__.py", line 49, in <module>
    from rclpy.signals import install_signal_handlers
  File "/Users/weizhaoli/ROS/ros2_humble/install/rclpy/lib/python3.7/site-packages/rclpy/signals.py", line 15, in <module>
    from rclpy.exceptions import InvalidHandle
  File "/Users/weizhaoli/ROS/ros2_humble/install/rclpy/lib/python3.7/site-packages/rclpy/exceptions.py", line 15, in <module>
    from rclpy.impl.implementation_singleton import rclpy_implementation as _rclpy
  File "/Users/weizhaoli/ROS/ros2_humble/install/rclpy/lib/python3.7/site-packages/rclpy/impl/implementation_singleton.py", line 32, in <module>
    rclpy_implementation = import_c_library('._rclpy_pybind11', package)
  File "/Users/weizhaoli/ROS/ros2_humble/build/rpyutils/rpyutils/import_c_library.py", line 39, in import_c_library
    return importlib.import_module(name, package=package)
  File "/usr/local/Cellar/python@3.10/3.10.6_2/Frameworks/Python.framework/Versions/3.10/lib/python3.10/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
ModuleNotFoundError: No module named 'rclpy._rclpy_pybind11'
The C extension '/Users/weizhaoli/ROS/ros2_humble/build/rpyutils/_rclpy_pybind11.cpython-310-darwin.so' isn't present on the system. Please refer to 'https://docs.ros.org/en/humble/Guides/Installation-Troubleshooting.html#import-failing-without-library-present-on-the-system' for possible solutions
[ros2run]: Process exited with failure 1

I know there is a similar post but the answer does not fix my issue since I didn't have conda. And I am confused why there is python3.7 and I don't have python3.7 in my system.

Thank you!

Asked by ever on 2022-09-27 20:30:47 UTC

Answer 1

You can try to use docker to use ROS 2 on your Mac instead:

The first steps will be a bit harder because of new tool, but it will make everything easier later - there is a wonderful tutorial how to use ROS dockers with VS Code:

https://github.com/athackst/vscode_ros2_workspace

I think it is worth trying.

Asked by ljaniec on 2022-09-28 08:24:20 UTC

Comments

Thank you so much for the reply. I am not familiar with docker. But I will take a look at it.

Asked by ever on 2022-09-28 09:09:57 UTC

ModuleNotFoundError: No module named 'rclpy._rclpy_pybind11'

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Answers

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