# Problems in compiling actions quiz **URL:** \ **Category:** ROS2 in 5 Days C++\ **Created:** [August 22, 2023, 2:55pm UTC](https://get-help.theconstruct.ai/t/problems-in-compiling-actions-quiz/25916 "2023-08-22T14:55:46Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![Simo97](https://get-help.theconstruct.ai/letter_avatar_proxy/v4/letter/s/cab0a1/32.png) [@Simo97](https://get-help.theconstruct.ai/u/Simo97)\ **Post date:** [August 22, 2023, 2:55pm UTC](https://get-help.theconstruct.ai/t/problems-in-compiling-actions-quiz/25916/1 "2023-08-22T14:55:46Z")
Hi! I completed the actions quiz and it works, but when I submit the quiz I have strange errors: ![image](https://get-help.robotigniteacademy.com/uploads/default/original/2X/a/a9317e0e906342381ed3dbf38a0f80f7b7543c2a.png) This is really strange, because before submitting the quiz everything works well and I can compile with colcon build. After having submitted, if I try again, I have this ![image](https://get-help.robotigniteacademy.com/uploads/default/original/2X/8/840058e75ab0bcd9477a8aac2a970a152781894b.png) ![image](https://get-help.robotigniteacademy.com/uploads/default/original/2X/1/13e0c9646efc89d551388c73bf5d873b9ad508ef.png) ![image](https://get-help.robotigniteacademy.com/uploads/default/original/2X/0/0a94847f0df2947efb462c568d250b64ee21b59f.png) It seems a bug with colcon build. If I recompile with these lines: _cd ~/ros2\_ws_ _rm -rf build/ install/ log/_ _colcon build_ _source install/setup.bash_ _colcon build_ does not work. If I compile with the --packages-select option and **in the correct order** (for instance, actions\_quiz\_msg and then actions\_quiz) everything is ok. What is the problem? Can you help me? Thanks in advance ---
**Author:** ![bayodesegun](https://get-help.theconstruct.ai/user_avatar/get-help.theconstruct.ai/bayodesegun/32/10684_2.png) [@bayodesegun](https://get-help.theconstruct.ai/u/bayodesegun)\ **Post date:** [August 23, 2023, 9:38am UTC](https://get-help.theconstruct.ai/t/problems-in-compiling-actions-quiz/25916/3 "2023-08-23T09:38:30Z")
That error makes sense, because `actions_quiz` depends on `actions_quiz_msg`, so the latter has to be compiled before the former. What seems to be missing here are some entries in `CMakeLists.txt` and/or `package.xml`, telling `colcon build` what package must be built first. How did you create `actions_quiz`? Did you pass `actions_quiz_msg` as a dependency when creating the package? ---
**Author:** ![Simo97](https://get-help.theconstruct.ai/letter_avatar_proxy/v4/letter/s/cab0a1/32.png) [@Simo97](https://get-help.theconstruct.ai/u/Simo97)\ **Post date:** [August 23, 2023, 9:43am UTC](https://get-help.theconstruct.ai/t/problems-in-compiling-actions-quiz/25916/4 "2023-08-23T09:43:42Z")
Hi @bayodesegun, thanks for your response. No, I did not add actions\_quiz\_msg as a dependency. I first created and compiled actions\_quiz, then actions\_quiz\_msg and finally I modified the CmakeLists of actions\_quiz by adding find\_packages and the right dependencies. ---
**Author:** ![bayodesegun](https://get-help.theconstruct.ai/user_avatar/get-help.theconstruct.ai/bayodesegun/32/10684_2.png) [@bayodesegun](https://get-help.theconstruct.ai/u/bayodesegun)\ **Post date:** [August 23, 2023, 9:50am UTC](https://get-help.theconstruct.ai/t/problems-in-compiling-actions-quiz/25916/5 "2023-08-23T09:50:01Z")
I suspect that you didn’t add all the necessary entries, or there is some bug. Manually adding entries is prone to errors. Here is what you can do to debug: > Create a new test package, say `actions_quiz_test` and add `actions_quiz_msg` as dependency during creation. Then compare the entries in the `CMakeLists.txt` and `package.xml` of this test package to what you have in the same files in `actions_quiz`. Make necessary corrections and let’s know how it goes. ---
**Author:** ![Simo97](https://get-help.theconstruct.ai/letter_avatar_proxy/v4/letter/s/cab0a1/32.png) [@Simo97](https://get-help.theconstruct.ai/u/Simo97)\ **Post date:** [August 23, 2023, 10:14am UTC](https://get-help.theconstruct.ai/t/problems-in-compiling-actions-quiz/25916/6 "2023-08-23T10:14:26Z")
Thank you @bayodesegun, I missed **\< depend\>actions\_quiz\_msg\< /depend\>** in package.xml Thank you for your support ---
**Author:** ![system](https://get-help.theconstruct.ai/uploads/default/original/2X/9/9d3ce8305cc0d0d9b6e07d15767a6f245c526f1b.jpeg) [@system](https://get-help.theconstruct.ai/u/system)\ **Post date:** [August 28, 2023, 10:14am UTC](https://get-help.theconstruct.ai/t/problems-in-compiling-actions-quiz/25916/7 "2023-08-28T10:14:59Z")
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