# Python for Robotics course Bug - Cooper error **URL:** \ **Category:** Python for Robotics\ **Created:** [December 24, 2025, 3:46pm UTC](https://get-help.theconstruct.ai/t/python-for-robotics-course-bug-cooper-error/39412 "2025-12-24T15:46:05Z")\ **Posts on this page:** 13\ **Page:** 1
**Author:** ![Patrick54](https://get-help.theconstruct.ai/letter_avatar_proxy/v4/letter/p/7c8e57/32.png) [@Patrick54](https://get-help.theconstruct.ai/u/Patrick54)\ **Post date:** [December 24, 2025, 3:46pm UTC](https://get-help.theconstruct.ai/t/python-for-robotics-course-bug-cooper-error/39412/1 "2025-12-24T15:46:06Z")
Hello when I start the scripit in the module Python for Robotic and if I follow exactly the tutorial I have this message from whwn I start pyscript1.py from your Dev environnment. ![image](https://get-help.theconstruct.ai/uploads/default/original/2X/c/c75cb1db21951044023c60522aa97f7fcf5ee53b.png) ERROR] [1766590430.291209]: Current /cooper\_1/scan not ready yet, retrying for getting scan Any Idea about this message? ---
**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:** [December 29, 2025, 10:01am UTC](https://get-help.theconstruct.ai/t/python-for-robotics-course-bug-cooper-error/39412/2 "2025-12-29T10:01:24Z")
Could you please provide more details about what you are trying to do? - Which unit of the course? - Which specific exercise or example are you following? - Did you follow all previous exercises from the first unit of the course without skipping any? If not, you might be missing important code - Did you follow all other instructions before running the code that returned this error? Please also share a screenshot of the entire screen, showing the error in the terminal. The image you shared here does not show the error. ---
**Author:** ![Patrick54](https://get-help.theconstruct.ai/letter_avatar_proxy/v4/letter/p/7c8e57/32.png) [@Patrick54](https://get-help.theconstruct.ai/u/Patrick54)\ **Post date:** [December 30, 2025, 9:17am UTC](https://get-help.theconstruct.ai/t/python-for-robotics-course-bug-cooper-error/39412/3 "2025-12-30T09:17:12Z")
Dear, the unit course is : Python pour la robotique , Python for robotic Unit 2 : Unité 2 Les bases de Python , Python bases - Exercice 2.1 - I followed all previous all previous exercices without skipping any I followed all instructions ![Error Cooper Script](https://get-help.theconstruct.ai/uploads/default/original/2X/2/24f0785d66e8f7c39d384410ace76f6a7f652a00.jpeg) ---
**Author:** ![Patrick54](https://get-help.theconstruct.ai/letter_avatar_proxy/v4/letter/p/7c8e57/32.png) [@Patrick54](https://get-help.theconstruct.ai/u/Patrick54)\ **Post date:** [December 30, 2025, 9:19am UTC](https://get-help.theconstruct.ai/t/python-for-robotics-course-bug-cooper-error/39412/4 "2025-12-30T09:19:25Z")
Dear, the unit course is : Python pour la robotique , Python for robotic Unit 2 : Unité 2 Les bases de Python , Python bases - Exercice 2.1 - I followed all previous all previous exercices without skipping any I followed all instructions regards Patrick Schild ---
**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:** [December 30, 2025, 11:17am UTC](https://get-help.theconstruct.ai/t/python-for-robotics-course-bug-cooper-error/39412/5 "2025-12-30T11:17:00Z")
From this error message, it looks like the scan topic is not working, so it’s likely that the simulation was not fully ready (indicated by some red dots on the simulation screen). Could you please share a screenshot of the whole screen showing the simulation and the other parts so we can see if the simulation is ready. ---
**Author:** ![xiao\_feng](https://get-help.theconstruct.ai/letter_avatar_proxy/v4/letter/x/8dc957/32.png) [@xiao\_feng](https://get-help.theconstruct.ai/u/xiao_feng)\ **Post date:** [December 30, 2025, 3:59pm UTC](https://get-help.theconstruct.ai/t/python-for-robotics-course-bug-cooper-error/39412/6 "2025-12-30T15:59:42Z")
I also encountered this problem.here is the screenshot. ![image](https://get-help.theconstruct.ai/uploads/default/original/2X/e/e5f440fbe9c0fda2c387894562d5be074e45545f.jpeg) ---
**Author:** ![xiao\_feng](https://get-help.theconstruct.ai/letter_avatar_proxy/v4/letter/x/8dc957/32.png) [@xiao\_feng](https://get-help.theconstruct.ai/u/xiao_feng)\ **Post date:** [December 30, 2025, 4:01pm UTC](https://get-help.theconstruct.ai/t/python-for-robotics-course-bug-cooper-error/39412/7 "2025-12-30T16:01:33Z")
Furthermore, I found using the `rostopic list` command that the `/cooper_1/scan` topic is not running. Looking forward to your reply, thank you. ![image](https://get-help.theconstruct.ai/uploads/default/original/2X/a/a1653ef5407945999c23c51dc4aea1565e09c862.jpeg) ---
**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:** [December 30, 2025, 4:52pm UTC](https://get-help.theconstruct.ai/t/python-for-robotics-course-bug-cooper-error/39412/8 "2025-12-30T16:52:19Z")
@xiao_feng Thank you for sharing the image. I can see that you are having the “red square dots” problem. Please have a look at this post to see how you could resolve it: - [How to fix an unresponsive simulation with red square dots in top-left corner](https://get-help.theconstruct.ai/t/how-to-fix-an-unresponsive-simulation-with-red-square-dots-in-top-left-corner/38962) @Patrick54 perhaps you also see the red square dots? If so, please also check the post. ---
**Author:** ![Patrick54](https://get-help.theconstruct.ai/letter_avatar_proxy/v4/letter/p/7c8e57/32.png) [@Patrick54](https://get-help.theconstruct.ai/u/Patrick54)\ **Post date:** [December 30, 2025, 5:31pm UTC](https://get-help.theconstruct.ai/t/python-for-robotics-course-bug-cooper-error/39412/9 "2025-12-30T17:31:22Z")
With Chrome from fresh install and Antivirus disabled. Same issue. ![image](https://get-help.theconstruct.ai/uploads/default/original/2X/0/032991d78aabea807d936f4dfc3cf84cc4b41e5e.jpeg) ---
**Author:** ![Patrick54](https://get-help.theconstruct.ai/letter_avatar_proxy/v4/letter/p/7c8e57/32.png) [@Patrick54](https://get-help.theconstruct.ai/u/Patrick54)\ **Post date:** [December 30, 2025, 5:38pm UTC](https://get-help.theconstruct.ai/t/python-for-robotics-course-bug-cooper-error/39412/10 "2025-12-30T17:38:42Z")
Same with Mozilla. ![image](https://get-help.theconstruct.ai/uploads/default/original/2X/1/1654cd20ae87bb84057142501d73757922919026.jpeg) ---
**Author:** ![xiao\_feng](https://get-help.theconstruct.ai/letter_avatar_proxy/v4/letter/x/8dc957/32.png) [@xiao\_feng](https://get-help.theconstruct.ai/u/xiao_feng)\ **Post date:** [December 31, 2025, 5:16am UTC](https://get-help.theconstruct.ai/t/python-for-robotics-course-bug-cooper-error/39412/11 "2025-12-31T05:16:45Z")
Thank you so much for your help. Have a nice day! 😚 ---
**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:** [December 31, 2025, 10:05am UTC](https://get-help.theconstruct.ai/t/python-for-robotics-course-bug-cooper-error/39412/12 "2025-12-31T10:05:34Z")
@Patrick54 Could you please try a different Internet connection and/or a different PC, if possible? Something on your PC/network/browser is blocking the simulation topics. @xiao_feng I suppose trying another browser worked for you…please let us know what you did. It will help someone! ---
**Author:** ![system](https://get-help.theconstruct.ai/uploads/default/original/2X/9/9d3ce8305cc0d0d9b6e07d15767a6f245c526f1b.jpeg) [@system](https://get-help.theconstruct.ai/u/system)\ **Post date:** [January 10, 2026, 10:06am UTC](https://get-help.theconstruct.ai/t/python-for-robotics-course-bug-cooper-error/39412/13 "2026-01-10T10:06:33Z")
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