I try to build nav2_ws from tutorial on nav2 build and install, and I get this error
--- stderr: nav_2d_msgs Error processing idl file: /home/uchi/nav2_ws/build/nav_2d_msgs/rosidl_adapter/nav_2d_msgs/msg/Path2D.idl Traceback (most recent call last): File "/home/uchi/ros2_humble/install/rosidl_generator_py/share/rosidl_generator_py/cmake/../../../lib/rosidl_generator_py/rosidl_generator_py", line 40, in <module> sys.exit(main()) ^^^^^^ File "/home/uchi/ros2_humble/install/rosidl_generator_py/share/rosidl_generator_py/cmake/../../../lib/rosidl_generator_py/rosidl_generator_py", line 36, in main generate_py(args.generator_arguments_file, args.typesupport_impls.split(';')) File "/opt/ros/humble/local/lib/python3.10/dist-packages/rosidl_generator_py/generate_py_impl.py", line 61, in generate_py generated_files = generate_files(generator_arguments_file, mapping) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/ros/humble/local/lib/python3.10/dist-packages/rosidl_cmake/__init__.py", line 96, in generate_files raise(e) File "/opt/ros/humble/local/lib/python3.10/dist-packages/rosidl_cmake/__init__.py", line 87, in generate_files expand_template( File "/opt/ros/humble/local/lib/python3.10/dist-packages/rosidl_cmake/__init__.py", line 128, in expand_template interpreter = em.Interpreter( ^^^^^^^^^^^^^^ AttributeError: module 'em' has no attribute 'Interpreter' gmake[2]: *** [nav_2d_msgs__py/CMakeFiles/nav_2d_msgs__py.dir/build.make:167: rosidl_generator_py/nav_2d_msgs/_nav_2d_msgs_s.ep.rosidl_typesupport_fastrtps_c.c] Error 1 gmake[1]: *** [CMakeFiles/Makefile2:590: nav_2d_msgs__py/CMakeFiles/nav_2d_msgs__py.dir/all] Error 2 gmake: *** [Makefile:146: all] Error 2 --- Failed <<< nav_2d_msgs [2.83s, exited with code 2] Aborted <<< nav2_msgs [2.24s] It failed on building nav_2d_msgs. Does anyone know how to fix this?
SOLVED: To fix this, I uninstall em, which might cause the conflict, and install pip install empy & lark. But it lead to another error AttributeError: module 'em' has no attribute "'BUFFERED_OPT'". The problem is new empy version doesn't have BUFFTERD_OPT or RAW_OPT anymore, from what I understand. I need to install old version of pip install empy==3.3.4. Solution found here
