ros2genmsg: ERROR building package

I want to create ROS2 custum message(px4_msgs).

>>  ros2genmsg("C:\ros2pkg\custom_msgs",'BuildConfiguration','fasterruns')
フォルダー 'C:/ros2pkg/custom_msgs' のメッセージ ファイルを識別しています。.完了。
フォルダー 'C:/ros2pkg/custom_msgs' のメッセージ ファイルを検証しています。..完了。
[1/1] カスタム メッセージ パッケージ用の MATLAB インターフェイスを生成しています... 完了。
フォルダー 'C:/ros2pkg/custom_msgs/matlab_msg_gen/win64' の colcon ビルドを実行しています。
ビルドが進行中です。これには数分かかることがあります...エラー: ros.internal.ROSProjectBuilder/buildPackage (行 534)
Error building package: **********************************************************************
** Visual Studio 2017 Developer Command Prompt v15.9.36
** Copyright (c) 2017 Microsoft Corporation
**********************************************************************
[vcvarsall.bat] Environment initialized for: 'x86_x64'
.

エラー: ros2genmsg (行 241)
    buildPackage(builder, [], ' --merge-install', colconMakeArgs); %other messages might need to
    be present in the same directory

I recieved these errors above.

I updated MATLAB2021a and using python 2.7.

I'm also using visual studio 2017.

How can I do ?

[Jagadeesh Konakalla]

Hi Kenta Okamoto,

I have downloaded px4_msgs from the following and able to build successfully on my end.

https://github.com/PX4/px4_msgs/archive/refs/heads/ros2.zip

It could be related to some enviorment (CMAKE, Python 3.7 and message dependencies) issue. Please note that you need python 3.7 for ros2 custom message generation. In your message, i see you set it to 2.7. This could be the root cause. Please see the ros2 requirements section in the following link.

https://www.mathworks.com/help/ros/gs/ros-system-requirements.html

In the custom message folder, you will see a folder named with matlab_msg_gen. Please see the following snapshot. Can you please check for the stdout.log file for more information on the error and let me know ?

Thanks,

Jagadeesh K

[Kenta Okamoto]

Thank you for replying.

I checked I have python 3.7 and set pyenv. and I downloaded px4_msgs from above link,

but I had same error message.

Checking matlab_msg_gen, but i couldn't find stderr.log.

I may have something error on clolcon ?

[Kenta Okamoto]

I tried re-install all required tolls and MATLAB. Then I could build messages.

I had python 3.8, 3.9, 3.7 and 2.7 . I think that uninstalling python might be solving this problem.

Thank you .

[Jagadeesh Konakalla]

It is good to know that problem is solved. Yes, it is always good to have one required version of Python in Path.

[Steven Lord]

Kenta Okamoto had flagged this "This solved problem". Please use flags to bring a problem with the answer to the attention of the administrators and the MVPs. Use comments or marking an answer as the Accepted answer to indicate that it has answered the question.

[Rik]

@Jagadeesh Konakalla Please post your comment as answer so Kenta (or someone else) can mark it as accepted answer.

Answer 1

[Jagadeesh Konakalla]

Uninstalling different versions of python solved the problem.