Issue with Humble tutorial creating a workspace when running colcon build

asked 2022-09-20 13:52:32 -0600

ottomusprime gravatar image

updated 2022-09-21 00:05:40 -0600

ravijoshi gravatar image

I am going through humble tutorial on creating a workspace. At step 5: build a workspace with colcon, I encounter an error after running colcon build --merge-install command.

C:\ros2_ws\src>colcon build --merge-install
Starting >>> turtlesim
--- stderr: turtlesim
CMake Error at C:/dev/ros2_humble/ros2-windows/share/rosidl_adapter/cmake/rosidl_adapt_interfaces.cmake:59 (message):
  execute_process(C:/Users/Otto/anaconda3/python.exe -m rosidl_adapter
  --package-name turtlesim --arguments-file
  C:/ros2_ws/src/build/turtlesim/rosidl_adapter__arguments__turtlesim.json
  --output-dir C:/ros2_ws/src/build/turtlesim/rosidl_adapter/turtlesim
  --output-file C:/ros2_ws/src/build/turtlesim/rosidl_adapter/turtlesim.idls)
  returned error code 1:

  Traceback (most recent call last):

    File "C:\Users\Otto\anaconda3\lib\runpy.py", line 194, in _run_module_as_main
      return _run_code(code, main_globals, None,
    File "C:\Users\Otto\anaconda3\lib\runpy.py", line 87, in _run_code
      exec(code, run_globals)
    File "C:\dev\ros2_humble\ros2-windows\Lib\site-packages\rosidl_adapter\__main__.py", line 19, in <module>
      sys.exit(main())
    File "C:\dev\ros2_humble\ros2-windows\Lib\site-packages\rosidl_adapter\main.py", line 53, in main
      abs_idl_file = convert_to_idl(
    File "C:\dev\ros2_humble\ros2-windows\Lib\site-packages\rosidl_adapter\__init__.py", line 28, in convert_to_idl
      from rosidl_adapter.action import convert_action_to_idl
    File "C:\dev\ros2_humble\ros2-windows\Lib\site-packages\rosidl_adapter\action\__init__.py", line 16, in <module>
      from rosidl_adapter.resource import expand_template
    File "C:\dev\ros2_humble\ros2-windows\Lib\site-packages\rosidl_adapter\resource\__init__.py", line 19, in <module>
      import em

  ModuleNotFoundError: No module named 'em'

Call Stack (most recent call first):
  C:/dev/ros2_humble/ros2-windows/share/rosidl_cmake/cmake/rosidl_generate_interfaces.cmake:130 (rosidl_adapt_interfaces)
  CMakeLists.txt:24 (rosidl_generate_interfaces)


---
Failed   <<< turtlesim [2.08s, exited with code 1]

Summary: 0 packages finished [2.33s]
  1 package failed: turtlesim
  1 package had stderr output: turtlesim

So after this error I install the missing module em using pip install em and receive another error after running colcon build --merge-install again

colcon.colcon_core.entry_point ERROR Exception loading extension 'colcon_core.environment_variable.powershell_command': cannot import name 'Interpreter' from 'em' (c:\python38\lib\site-packages\em\__init__.py) The Python package 'empy' must be installed and 'em' must not be installed since both packages share the same namespace
Traceback (most recent call last):
  File "c:\python38\lib\site-packages\colcon_core\entry_point.py", line 120, in load_entry_points
    extension_type = load_entry_point(entry_point)
  File "c:\python38\lib\site-packages\colcon_core\entry_point.py", line 166, in load_entry_point
    return entry_point.load()
  File "c:\python38\lib\site-packages\pkg_resources\__init__.py", line 2465, in load
    return self.resolve()
  File "c:\python38\lib\site-packages\pkg_resources\__init__.py", line 2471, in resolve
    module = __import__(self.module_name, fromlist=['__name__'], level=0)
  File "c:\python38\lib\site-packages\colcon_powershell\shell\powershell.py", line 17, in <module>
    from colcon_core.shell.template import expand_template
  File "c:\python38\lib\site-packages\colcon_core\shell\template\__init__.py", line 19, in <module>
    raise e from None
  File "c:\python38\lib\site-packages\colcon_core\shell\template\__init__.py", line 9, in <module>
    from em import Interpreter
ImportError: cannot import name 'Interpreter' from 'em' (c:\python38\lib\site-packages\em\__init__.py) The Python package 'empy' must be installed and 'em' must not be installed since both packages share the same namespace

So my question is how ... (more)

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Comments

this may help #q257331

ravijoshi gravatar image ravijoshi  ( 2022-09-21 01:40:13 -0600 )edit

I've seen this post and tried the solutions but they haven't worked.

ottomusprime gravatar image ottomusprime  ( 2022-09-21 16:10:18 -0600 )edit