# ROS Basics In 5 Days (Python) **URL:** https://get-help.theconstruct.ai/c/course-support/rosbasicsin5days/7.md [Latest](https://get-help.theconstruct.ai/latest.md) · [Categories](https://get-help.theconstruct.ai/categories.md) · [Tags](https://get-help.theconstruct.ai/tags.md) --- ## [About the ROS Basics In 5 Days (Python) category](https://get-help.theconstruct.ai/t/about-the-ros-basics-in-5-days-python-category/15)
**Author:** [@bayodesegun](https://get-help.theconstruct.ai/u/bayodesegun)\ **Replies:** 0\ **Last updated:** [July 16, 2019, 10:57am UTC](https://get-help.theconstruct.ai/t/about-the-ros-basics-in-5-days-python-category/15 "2019-07-16T10:57:01Z")
This category is for questions and discussions related to the ROS Basics in 5 Days (Python) course. Before posting a new question, please use the search button to see if a similar topic already exists. --- ## [\[BUG\] ROS Basics in 5 days (Python) 3.10 Quiz](https://get-help.theconstruct.ai/t/bug-ros-basics-in-5-days-python-3-10-quiz/42530)
**Author:** [@cmismash](https://get-help.theconstruct.ai/u/cmismash)\ **Replies:** 1\ **Last updated:** [September 14, 2026, 9:49am UTC](https://get-help.theconstruct.ai/t/bug-ros-basics-in-5-days-python-3-10-quiz/42530 "2026-09-14T09:49:05Z")
I’ve completed the 3.10 Quiz with 10/10 marks, the green check never updated and now that I’ve checked solution I cant even try to re-grade it for the update. I need to show that this topic has been passed for a univers… --- ## [\[Bug\] connection error](https://get-help.theconstruct.ai/t/bug-connection-error/41688)
**Author:** [@karga](https://get-help.theconstruct.ai/u/karga)\ **Replies:** 1\ **Last updated:** [July 8, 2026, 10:47am UTC](https://get-help.theconstruct.ai/t/bug-connection-error/41688 "2026-07-08T10:47:35Z")
This is an error report. Screenshot of the error Error details my internet speed is more than 50 mbps but still i am taking connection error why ? --- ## [Submit Topics Quiz not working](https://get-help.theconstruct.ai/t/submit-topics-quiz-not-working/41564)
**Author:** [@sohaib.arshid101](https://get-help.theconstruct.ai/u/sohaib.arshid101)\ **Replies:** 5\ **Last updated:** [July 2, 2026, 12:55pm UTC](https://get-help.theconstruct.ai/t/submit-topics-quiz-not-working/41564 "2026-07-02T12:55:24Z")
Hello I have attempted my Topics quiz but when I click the Submit the Quiz button nothing happens, I do not know whether it is being submitted or not and i have no feedback from anywhere. Can someone help? --- ## [Unit 5.5 Callbacks in ROS2. Plant Detector Example](https://get-help.theconstruct.ai/t/unit-5-5-callbacks-in-ros2-plant-detector-example/39598)
**Author:** [@ninadmehta34](https://get-help.theconstruct.ai/u/ninadmehta34)\ **Replies:** 5\ **Last updated:** [January 13, 2026, 7:10am UTC](https://get-help.theconstruct.ai/t/unit-5-5-callbacks-in-ros2-plant-detector-example/39598 "2026-01-13T07:10:18Z")
In the above mentioned unit, we need to run the ‘plant detector’ script with and without a plant in robot’s sight, record the execution of callbacks (listener callback and detected plant callback), and observe the callba… --- ## [\[Bug\] can not access publisher and active drone](https://get-help.theconstruct.ai/t/bug-can-not-access-publisher-and-active-drone/39267)
**Author:** [@Rosenes](https://get-help.theconstruct.ai/u/Rosenes)\ **Replies:** 1\ **Last updated:** [December 15, 2025, 3:54pm UTC](https://get-help.theconstruct.ai/t/bug-can-not-access-publisher-and-active-drone/39267 "2025-12-15T15:54:22Z")
This is an error report. Screenshot of the error Error details When I send rostopic info /cmd\_vel it said none for publisher and and I fixed the python code with the construct ai assistant however the errror didnt … --- ## [2.2 Move a Robot - Wrong Keys for Input?](https://get-help.theconstruct.ai/t/2-2-move-a-robot-wrong-keys-for-input/38960)
**Author:** [@Gnome](https://get-help.theconstruct.ai/u/Gnome)\ **Replies:** 12\ **Last updated:** [November 26, 2025, 8:34am UTC](https://get-help.theconstruct.ai/t/2-2-move-a-robot-wrong-keys-for-input/38960 "2025-11-26T08:34:15Z")
I cannot move the robot using the “uio jkl m,.” keys as specified, but I CAN move the robot using WSAD. Is this an intended operation, or is there a bug here? --- ## [Package missing](https://get-help.theconstruct.ai/t/package-missing/38752)
**Author:** [@Pietroterranova7](https://get-help.theconstruct.ai/u/Pietroterranova7)\ **Replies:** 6\ **Last updated:** [November 6, 2025, 2:26pm UTC](https://get-help.theconstruct.ai/t/package-missing/38752 "2025-11-06T14:26:53Z")
--- ## [Problem with Services Quiz solution](https://get-help.theconstruct.ai/t/problem-with-services-quiz-solution/38659)
**Author:** [@oril](https://get-help.theconstruct.ai/u/oril)\ **Replies:** 1\ **Last updated:** [October 27, 2025, 10:37am UTC](https://get-help.theconstruct.ai/t/problem-with-services-quiz-solution/38659 "2025-10-27T10:37:09Z")
I experience the same problem Please help --- ## [Solution of Services Quiz](https://get-help.theconstruct.ai/t/solution-of-services-quiz/3176)
**Author:** [@gianmauro.fontana](https://get-help.theconstruct.ai/u/gianmauro.fontana)\ **Replies:** 7\ **Last updated:** [May 7, 2020, 7:54am UTC](https://get-help.theconstruct.ai/t/solution-of-services-quiz/3176 "2020-05-07T07:54:43Z")
Hello, I submitted the Services Quiz, but when the grading process finishes I don’t find the correct solution of the quiz. Where can I find it? --- ## [Failing tasks 1a and 2b in the basics exam drone challenge. Help!](https://get-help.theconstruct.ai/t/failing-tasks-1a-and-2b-in-the-basics-exam-drone-challenge-help/38421)
**Author:** [@ZeshiChen](https://get-help.theconstruct.ai/u/ZeshiChen)\ **Replies:** 3\ **Last updated:** [October 16, 2025, 10:58am UTC](https://get-help.theconstruct.ai/t/failing-tasks-1a-and-2b-in-the-basics-exam-drone-challenge-help/38421 "2025-10-16T10:58:23Z")
This is an error report. Screenshot of the error Error details I don't know why I keep failing the test for task 1a in the bascis\_exam. However, when I run roslaunch bascis\_exam drone\_off.launch alone, the drone ca… --- ## [Gradebot Keeps Failing My Subscriber](https://get-help.theconstruct.ai/t/gradebot-keeps-failing-my-subscriber/38243)
**Author:** [@kc2023](https://get-help.theconstruct.ai/u/kc2023)\ **Replies:** 2\ **Last updated:** [September 29, 2025, 8:41am UTC](https://get-help.theconstruct.ai/t/gradebot-keeps-failing-my-subscriber/38243 "2025-09-29T08:41:32Z")
I can’t report it with the button as every time I have tried it won’t stop buffering endlessly. Gradebot keeps telling me that I’m not subscribed despite me now fixing my error from the first time around. When I launch … --- ## [Topic laser\_scan has no messages and cmd\_vel does nothing](https://get-help.theconstruct.ai/t/topic-laser-scan-has-no-messages-and-cmd-vel-does-nothing/38234)
**Author:** [@KaiYourPal](https://get-help.theconstruct.ai/u/KaiYourPal)\ **Replies:** 3\ **Last updated:** [September 28, 2025, 12:18pm UTC](https://get-help.theconstruct.ai/t/topic-laser-scan-has-no-messages-and-cmd-vel-does-nothing/38234 "2025-09-28T12:18:37Z")
As the title suggests, when I use ros2 topic echo /laser\_scan, no output is displayed in the terminal. Similarly, when i published messages to the /cmd\_vel topic, it does nothing to the vehicle despite the topic having … --- ## [Subscriber isn't reading anything from LaserScan topic](https://get-help.theconstruct.ai/t/subscriber-isnt-reading-anything-from-laserscan-topic/38201)
**Author:** [@kc2023](https://get-help.theconstruct.ai/u/kc2023)\ **Replies:** 2\ **Last updated:** [September 25, 2025, 8:00am UTC](https://get-help.theconstruct.ai/t/subscriber-isnt-reading-anything-from-laserscan-topic/38201 "2025-09-25T08:00:51Z")
Hi, I’m a little confused as to where I’m going wrong with the Topics Quiz. I’ve only gotten the robot to move and turn left for now, but I think I’m not actually using the data from the subscriber? When I do rostopic e… --- ## [Failing services quiz](https://get-help.theconstruct.ai/t/failing-services-quiz/38067)
**Author:** [@sigmundgrind](https://get-help.theconstruct.ai/u/sigmundgrind)\ **Replies:** 2\ **Last updated:** [September 16, 2025, 2:01pm UTC](https://get-help.theconstruct.ai/t/failing-services-quiz/38067 "2025-09-16T14:01:18Z")
The Gradebot keeps failing me even though the program works flawless when I launch it myself. The point where I fail: :heavy\_multiplication\_x: \[19:28:04\] \[assess\] Could not launch services\_quiz service client successful… --- ## [Question about exercise 4.2](https://get-help.theconstruct.ai/t/question-about-exercise-4-2/38130)
**Author:** [@kc2023](https://get-help.theconstruct.ai/u/kc2023)\ **Replies:** 1\ **Last updated:** [September 19, 2025, 10:19am UTC](https://get-help.theconstruct.ai/t/question-about-exercise-4-2/38130 "2025-09-19T10:19:12Z")
Hiya, I have a question about the launch file included in the solution to 4.2. I managed to make my own subscriber that ran the Odometry data with no issue, but I never made a launch file. I wanted to know why they creat… --- ## [Services Quiz autograder failing for expected turn](https://get-help.theconstruct.ai/t/services-quiz-autograder-failing-for-expected-turn/37961)
**Author:** [@robhakta](https://get-help.theconstruct.ai/u/robhakta)\ **Replies:** 6\ **Last updated:** [September 16, 2025, 12:50pm UTC](https://get-help.theconstruct.ai/t/services-quiz-autograder-failing-for-expected-turn/37961 "2025-09-16T12:50:25Z")
I’ve submitted my quiz and got an error for when the grader checked if it performed the turn correctly (a right turn at 0.2 rad/s for 10 secs) However, I printed before and after the turn and the delta in the timesta… --- ## [About ROS topics\_quiz python](https://get-help.theconstruct.ai/t/about-ros-topics-quiz-python/37822)
**Author:** [@ninadmehta34](https://get-help.theconstruct.ai/u/ninadmehta34)\ **Replies:** 1\ **Last updated:** [September 1, 2025, 1:14am UTC](https://get-help.theconstruct.ai/t/about-ros-topics-quiz-python/37822 "2025-09-01T01:14:13Z")
The rover is either not moving at all or moving very slowly to the pick up location. When I prompt it to go back to home location, it reaches within certain distance and keeps rotating around. I feel this is because of … --- ## [Problema en curso fundamentos de ROS en python](https://get-help.theconstruct.ai/t/problema-en-curso-fundamentos-de-ros-en-python/37655)
**Author:** [@serranoperezz](https://get-help.theconstruct.ai/u/serranoperezz)\ **Replies:** 5\ **Last updated:** [August 25, 2025, 9:50am UTC](https://get-help.theconstruct.ai/t/problema-en-curso-fundamentos-de-ros-en-python/37655 "2025-08-25T09:50:01Z")
Hola buenas en el cuestionario del apartado 4.6 del mencionado curso no me deja corregir el curso. Ya he comprobado que funciona bien pero el boton verde de corregir no hace nada. Que puedo hacer? --- ## [Error en practica 4.5](https://get-help.theconstruct.ai/t/error-en-practica-4-5/37423)
**Author:** [@serranoperezz](https://get-help.theconstruct.ai/u/serranoperezz)\ **Replies:** 1\ **Last updated:** [August 6, 2025, 12:57pm UTC](https://get-help.theconstruct.ai/t/error-en-practica-4-5/37423 "2025-08-06T12:57:39Z")
al completar el ejercico me da este error y no se porque: ModuleNotFoundError: No module named ‘ej\_44’ ej\_44 es el nombre de mi paquete, no debería dar ese error. Saben porque puede ser? --- ## [Where is the autocorrect button?](https://get-help.theconstruct.ai/t/where-is-the-autocorrect-button/37357)
**Author:** [@chuchu90](https://get-help.theconstruct.ai/u/chuchu90)\ **Replies:** 1\ **Last updated:** [August 4, 2025, 1:56pm UTC](https://get-help.theconstruct.ai/t/where-is-the-autocorrect-button/37357 "2025-08-04T13:56:38Z")
where is the correct button for quiz? I can’t find it… --- ## [Compilar paquete](https://get-help.theconstruct.ai/t/compilar-paquete/37225)
**Author:** [@serranoperezz](https://get-help.theconstruct.ai/u/serranoperezz)\ **Replies:** 1\ **Last updated:** [July 24, 2025, 9:45am UTC](https://get-help.theconstruct.ai/t/compilar-paquete/37225 "2025-07-24T09:45:40Z")
en el apartado 2.9 donde veo el paquete my\_package compilado, no entiendo que tipo de archivo deberia generarse --- ## [Unit 3 Topics Quiz Autograder Issue](https://get-help.theconstruct.ai/t/unit-3-topics-quiz-autograder-issue/36984)
**Author:** [@imtaksheel](https://get-help.theconstruct.ai/u/imtaksheel)\ **Replies:** 2\ **Last updated:** [July 4, 2025, 10:05am UTC](https://get-help.theconstruct.ai/t/unit-3-topics-quiz-autograder-issue/36984 "2025-07-04T10:05:09Z")
I submitted the quiz and got and 8/10, but for some reason it wouldn’t register the score but it would remember the last autocorrection feedback report. I refreshed because it happened twice, and then I wasn’t able to su… --- ## [Section 3.10 Quiz dispute](https://get-help.theconstruct.ai/t/section-3-10-quiz-dispute/36588)
**Author:** [@mmoses](https://get-help.theconstruct.ai/u/mmoses)\ **Replies:** 3\ **Last updated:** [June 9, 2025, 11:08am UTC](https://get-help.theconstruct.ai/t/section-3-10-quiz-dispute/36588 "2025-06-09T11:08:41Z")
Hi, In my first attempt the quiz failed on “not subscribed to /odom”, as seen in the attached picture. I ran a second attempt without changing anything, and it passed the /odom subscription part, but failed later on on… --- ## [I don't know but help please (someone)](https://get-help.theconstruct.ai/t/i-dont-know-but-help-please-someone/36316)
**Author:** [@Fran\_oisMTY](https://get-help.theconstruct.ai/u/Fran_oisMTY)\ **Replies:** 5\ **Last updated:** [May 23, 2025, 2:47pm UTC](https://get-help.theconstruct.ai/t/i-dont-know-but-help-please-someone/36316 "2025-05-23T14:47:18Z")
After multiple attempts, quiz 4.9 still stubbornly refuses to pass. Yet when I test my code locally, the robot performs the expected movement without any issues. I’ve double-checked the instructions several times, and I … --- ## [AutoTest not working well... HELP](https://get-help.theconstruct.ai/t/autotest-not-working-well-help/36328)
**Author:** [@marcgthr](https://get-help.theconstruct.ai/u/marcgthr)\ **Replies:** 1\ **Last updated:** [May 21, 2025, 5:49pm UTC](https://get-help.theconstruct.ai/t/autotest-not-working-well-help/36328 "2025-05-21T17:49:08Z")
I passed the 3.10 autotest several times with an infinite loop bug in my program apparently, while my program works very well locally by executing the commands requested. Also, I was unable to complete my last test beca… --- ## [Topic Quiz mistake 7.9 Actions Quiz](https://get-help.theconstruct.ai/t/topic-quiz-mistake-7-9-actions-quiz/36190)
**Author:** [@jeffrey.jahja7](https://get-help.theconstruct.ai/u/jeffrey.jahja7)\ **Replies:** 3\ **Last updated:** [May 16, 2025, 8:30am UTC](https://get-help.theconstruct.ai/t/topic-quiz-mistake-7-9-actions-quiz/36190 "2025-05-16T08:30:31Z")
Hi I believe I was incorrectly marked for this section Weirdly enough when I was last marked, I received marks for having the bot launch the file correctly. Just unsure why it isn’t the case this time round. --- ## [Tracetools\_launch not found](https://get-help.theconstruct.ai/t/tracetools-launch-not-found/36110)
**Author:** [@jeffrey.jahja7](https://get-help.theconstruct.ai/u/jeffrey.jahja7)\ **Replies:** 2\ **Last updated:** [May 13, 2025, 11:41am UTC](https://get-help.theconstruct.ai/t/tracetools-launch-not-found/36110 "2025-05-13T11:41:52Z")
I am trying to use the tracetools\_launch package that I was using from chapter 6 of the course (multithreading) but I received this error ModuleNotFoundError: No module named 'tracetools\_launch' How should I fix this er… --- ## [ROS Basics in 5 Days Course - Run rosject](https://get-help.theconstruct.ai/t/ros-basics-in-5-days-course-run-rosject/35765)
**Author:** [@Hanin](https://get-help.theconstruct.ai/u/Hanin)\ **Replies:** 3\ **Last updated:** [April 16, 2025, 8:17pm UTC](https://get-help.theconstruct.ai/t/ros-basics-in-5-days-course-run-rosject/35765 "2025-04-16T20:17:02Z")
Hi All, I’ve been spending several days trying to complete the Wall Follower project from the “ROS Basics in 5 Days” course using the simulation environment in The Construct WebShell. At first, the project was going we… --- ## [Bug in 4.3 Hands-on Practice!](https://get-help.theconstruct.ai/t/bug-in-4-3-hands-on-practice/35334)
**Author:** [@viorel.gheorghe](https://get-help.theconstruct.ai/u/viorel.gheorghe)\ **Replies:** 3\ **Last updated:** [March 17, 2025, 11:24am UTC](https://get-help.theconstruct.ai/t/bug-in-4-3-hands-on-practice/35334 "2025-03-17T11:24:58Z")
Hi there! If I login and go straight to section 4, the Turtlebot sim does not start all the topics. I was looking for /cmd\_vel and /odom. If I go to section 2 and then jump to 4 fortunately the necessary topics needed … [Next page](https://get-help.theconstruct.ai/c/course-support/rosbasicsin5days/7.md?page=1)