# ROS Beginners Exam **URL:** https://get-help.theconstruct.ai/c/course-support/igniteacademyrosfinalexam/35.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 Beginners Exam category](https://get-help.theconstruct.ai/t/about-the-ros-beginners-exam-category/47)
**Author:** [@bayodesegun](https://get-help.theconstruct.ai/u/bayodesegun)\ **Replies:** 0\ **Last updated:** [July 17, 2019, 7:14pm UTC](https://get-help.theconstruct.ai/t/about-the-ros-beginners-exam-category/47 "2019-07-17T19:14:43Z")
This category is for questions and discussions related to the ROS Basics Final Exam. Before posting a new question, please use the search button to see if a similar topic already exists. --- ## [There is no /odom topic](https://get-help.theconstruct.ai/t/there-is-no-odom-topic/11890)
**Author:** [@mwk0900.na](https://get-help.theconstruct.ai/u/mwk0900.na)\ **Replies:** 1\ **Last updated:** [August 16, 2021, 8:06am UTC](https://get-help.theconstruct.ai/t/there-is-no-odom-topic/11890 "2021-08-16T08:06:35Z")
At the third task we were asked to provide an action server that could store the odometry readings in a list and send it as a result. The problem is that I cannot find any topic that publishes odometry readings !! Thes… --- ## [Error with custom service message](https://get-help.theconstruct.ai/t/error-with-custom-service-message/11636)
**Author:** [@patruska](https://get-help.theconstruct.ai/u/patruska)\ **Replies:** 7\ **Last updated:** [August 5, 2021, 8:17am UTC](https://get-help.theconstruct.ai/t/error-with-custom-service-message/11636 "2021-08-05T08:17:23Z")
I’m doing the exam and I’m facing an issue I cannot solve by myself. the problem is with task 2b, that requires creating a custom message. my code is #! /usr/bin/env python import rospy from std\_msgs.msg import Empt… --- ## [Calling a service through an action?](https://get-help.theconstruct.ai/t/calling-a-service-through-an-action/9529)
**Author:** [@torpanvil](https://get-help.theconstruct.ai/u/torpanvil)\ **Replies:** 5\ **Last updated:** [April 25, 2021, 3:35pm UTC](https://get-help.theconstruct.ai/t/calling-a-service-through-an-action/9529 "2021-04-25T15:35:56Z")
Just a quick question on the exam, task 3: I’ve got the rest of the stuff running, and i can return the action result fine when i do a rostopic pub to the action server topic. However, i’m considering my next step in re… --- ## [Gazebo unresponsive to service call](https://get-help.theconstruct.ai/t/gazebo-unresponsive-to-service-call/9458)
**Author:** [@torpanvil](https://get-help.theconstruct.ai/u/torpanvil)\ **Replies:** 4\ **Last updated:** [April 16, 2021, 9:00am UTC](https://get-help.theconstruct.ai/t/gazebo-unresponsive-to-service-call/9458 "2021-04-16T09:00:01Z")
Hello, I’m having an issue with task 2. I’ve got the drone moving, landing and taking off, and launch file works fine too. However, when calling the service /my\_service through the command line, the method take\_off() is… --- ## [Ctrl-z or rosnode kill doesn't work](https://get-help.theconstruct.ai/t/ctrl-z-or-rosnode-kill-doesnt-work/9408)
**Author:** [@ruediger](https://get-help.theconstruct.ai/u/ruediger)\ **Replies:** 3\ **Last updated:** [April 14, 2021, 8:13am UTC](https://get-help.theconstruct.ai/t/ctrl-z-or-rosnode-kill-doesnt-work/9408 "2021-04-14T08:13:38Z")
During the final exam, a terminal window can’t be stopped by ctrl-z. Looking into http://wiki.ros.org/rosnode#rosnode\_kill and trying this However, I can’t finish the exam with the /check\_distance\_as\_node still runnin… --- ## [Issues with exam correction](https://get-help.theconstruct.ai/t/issues-with-exam-correction/9003)
**Author:** [@benoitlagasse](https://get-help.theconstruct.ai/u/benoitlagasse)\ **Replies:** 4\ **Last updated:** [March 25, 2021, 8:34am UTC](https://get-help.theconstruct.ai/t/issues-with-exam-correction/9003 "2021-03-25T08:34:47Z")
Hi, I’m trying to do the final exam to get a certificate. I’ve followed all courses in the “ROS for beginners” path. my first problem is that the correction says my service doesn’t give the proper response while it do… --- ## [Autocorrect mark did not tally with final score (ROS Beginners Exam)](https://get-help.theconstruct.ai/t/autocorrect-mark-did-not-tally-with-final-score-ros-beginners-exam/8744)
**Author:** [@izzatfadzlon](https://get-help.theconstruct.ai/u/izzatfadzlon)\ **Replies:** 7\ **Last updated:** [March 15, 2021, 8:57am UTC](https://get-help.theconstruct.ai/t/autocorrect-mark-did-not-tally-with-final-score-ros-beginners-exam/8744 "2021-03-15T08:57:03Z")
Hi, I’ve been graded 8 marks using the autocorrect system, but my final score ended up with 0 marks. Is this a glitch? Cheers Not sure if this is related: I subscribed for 1 month of the “Learner” Plan two months b… --- ## [Catkin\_make errors](https://get-help.theconstruct.ai/t/catkin-make-errors/6901)
**Author:** [@marzanalam3](https://get-help.theconstruct.ai/u/marzanalam3)\ **Replies:** 2\ **Last updated:** [December 16, 2020, 1:31pm UTC](https://get-help.theconstruct.ai/t/catkin-make-errors/6901 "2020-12-16T13:31:25Z")
Thank you for your reply. I am trying to solve the problem. I have learned a lot of things from this path.Today it is working as expected. But I am facing another problem. When I am trying to create a custom action messa… --- ## [No module named path\_exam.srv](https://get-help.theconstruct.ai/t/no-module-named-path-exam-srv/7362)
**Author:** [@umberto.severino](https://get-help.theconstruct.ai/u/umberto.severino)\ **Replies:** 1\ **Last updated:** [January 6, 2021, 6:33am UTC](https://get-help.theconstruct.ai/t/no-module-named-path-exam-srv/7362 "2021-01-06T06:33:02Z")
Hi, I’ve as usually an error when importing from a folder. Using “rossrv list | grep MyCustomServiceMessage” and “rossrv show path\_exam/MyCustomServiceMessage” I can find the service but when I run the .launch it give m… --- ## [Ros basic final exam -- simulation not loading ---Urgent](https://get-help.theconstruct.ai/t/ros-basic-final-exam-simulation-not-loading-urgent/6872)
**Author:** [@marzanalam3](https://get-help.theconstruct.ai/u/marzanalam3)\ **Replies:** 1\ **Last updated:** [December 15, 2020, 9:37am UTC](https://get-help.theconstruct.ai/t/ros-basic-final-exam-simulation-not-loading-urgent/6872 "2020-12-15T09:37:42Z")
I am sorry to inform you that I am trying to solve the final exam of Ros basic path. I am actually facing difficulties. My simulation is loading continuously while other contents are working perfectly. So, I am now unabl… --- ## [No AR Drone Found in Final Exam](https://get-help.theconstruct.ai/t/no-ar-drone-found-in-final-exam/5578)
**Author:** [@qhuy.phm](https://get-help.theconstruct.ai/u/qhuy.phm)\ **Replies:** 7\ **Last updated:** [October 7, 2020, 7:41pm UTC](https://get-help.theconstruct.ai/t/no-ar-drone-found-in-final-exam/5578 "2020-10-07T19:41:59Z")
I took the final exam today but there is no drone found in the simulator. Is there anything wrong with the Final Exam? --- ## [Quiz correction)\_ drone\_take\_off](https://get-help.theconstruct.ai/t/quiz-correction-drone-take-off/5465)
**Author:** [@shravistakashyap](https://get-help.theconstruct.ai/u/shravistakashyap)\ **Replies:** 3\ **Last updated:** [September 30, 2020, 7:06am UTC](https://get-help.theconstruct.ai/t/quiz-correction-drone-take-off/5465 "2020-09-30T07:06:40Z")
I have submitted my code for first and I got decent score but bot full. The grader says my code doesn’t help to take it off. But while I am launching the code, it is taking off properly as per description. Find my code b… --- ## [Final Exam Submition and Time](https://get-help.theconstruct.ai/t/final-exam-submition-and-time/5194)
**Author:** [@chanyang0719](https://get-help.theconstruct.ai/u/chanyang0719)\ **Replies:** 1\ **Last updated:** [September 10, 2020, 9:49am UTC](https://get-help.theconstruct.ai/t/final-exam-submition-and-time/5194 "2020-09-10T09:49:44Z")
Hi! I never submit my final exam but the grader system is not working… I tried to resubmit it but it’s still not working What should I do…? --- ## [Taking exam before quiz](https://get-help.theconstruct.ai/t/taking-exam-before-quiz/5133)
**Author:** [@sasilva1998](https://get-help.theconstruct.ai/u/sasilva1998)\ **Replies:** 1\ **Last updated:** [September 8, 2020, 11:36am UTC](https://get-help.theconstruct.ai/t/taking-exam-before-quiz/5133 "2020-09-08T11:36:43Z")
Hello everyone, I just took the final exam for RosBasics without noticing actually quizes have to be with the certificate. I only did one of the quizes before taking the final exam, will this affect in any way? Will I s… --- ## [Catkin make not running](https://get-help.theconstruct.ai/t/catkin-make-not-running/4003)
**Author:** [@bhuratsidhu](https://get-help.theconstruct.ai/u/bhuratsidhu)\ **Replies:** 3\ **Last updated:** [June 10, 2020, 11:57am UTC](https://get-help.theconstruct.ai/t/catkin-make-not-running/4003 "2020-06-10T11:57:14Z")
@bayodesegun catkin\_make is not working --- ## [How to import custom action message](https://get-help.theconstruct.ai/t/how-to-import-custom-action-message/3961)
**Author:** [@bhuratsidhu](https://get-help.theconstruct.ai/u/bhuratsidhu)\ **Replies:** 1\ **Last updated:** [June 8, 2020, 1:48pm UTC](https://get-help.theconstruct.ai/t/how-to-import-custom-action-message/3961 "2020-06-08T13:48:25Z")
i have created a custom action message , it is in the action folder with name ‘RecordOdom.action’ in which i only have the result part It is in the custom\_action\_msg package @bayodesegun How to import that in my pytho… --- ## [Why does this error comes?](https://get-help.theconstruct.ai/t/why-does-this-error-comes/3954)
**Author:** [@bhuratsidhu](https://get-help.theconstruct.ai/u/bhuratsidhu)\ **Replies:** 12\ **Last updated:** [June 9, 2020, 12:24pm UTC](https://get-help.theconstruct.ai/t/why-does-this-error-comes/3954 "2020-06-09T12:24:44Z")
@bayodesegun Sir, Why this error is there ?? AttributeError: type object ‘Empty’ has no attribute ‘\_request\_class’ --- ## [Grade Not Correct](https://get-help.theconstruct.ai/t/grade-not-correct/3977)
**Author:** [@ricardo.rico-uribe](https://get-help.theconstruct.ai/u/ricardo.rico-uribe)\ **Replies:** 1\ **Last updated:** [June 9, 2020, 11:56am UTC](https://get-help.theconstruct.ai/t/grade-not-correct/3977 "2020-06-09T11:56:39Z")
Hi, i did the exam and got a 7.5 because the “action didn’t execute correctly” when i do it my self it works as intended, maybe there is something wrong with the automated system. --- ## [I am submiting my final exam 1st time](https://get-help.theconstruct.ai/t/i-am-submiting-my-final-exam-1st-time/3962)
**Author:** [@bhuratsidhu](https://get-help.theconstruct.ai/u/bhuratsidhu)\ **Replies:** 2\ **Last updated:** [June 8, 2020, 1:53pm UTC](https://get-help.theconstruct.ai/t/i-am-submiting-my-final-exam-1st-time/3962 "2020-06-08T13:53:21Z")
@bayodesegun I was trying to submit my final exam for the 1st time still it is showing i have submitted it once, but i havent submitted it And it is also show the some score which i dont think is correct --- ## [Confused on results](https://get-help.theconstruct.ai/t/confused-on-results/3549)
**Author:** [@mccannm](https://get-help.theconstruct.ai/u/mccannm)\ **Replies:** 2\ **Last updated:** [May 14, 2020, 5:03pm UTC](https://get-help.theconstruct.ai/t/confused-on-results/3549 "2020-05-14T17:03:05Z")
I am confused on what drone did not move enough means --- ## [Solution of final exam](https://get-help.theconstruct.ai/t/solution-of-final-exam/3545)
**Author:** [@naitrir21](https://get-help.theconstruct.ai/u/naitrir21)\ **Replies:** 3\ **Last updated:** [May 13, 2020, 11:30am UTC](https://get-help.theconstruct.ai/t/solution-of-final-exam/3545 "2020-05-13T11:30:45Z")
Hello experts, I am unable to see the solution of the final exam though the tab is available. Can I know what to do to view it? P.S please let me know asap, my subscription is getting over today --- ## [Exam won't load notebook, terminal, workspace or simulation window](https://get-help.theconstruct.ai/t/exam-wont-load-notebook-terminal-workspace-or-simulation-window/3222)
**Author:** [@malloyj](https://get-help.theconstruct.ai/u/malloyj)\ **Replies:** 11\ **Last updated:** [April 24, 2020, 4:28pm UTC](https://get-help.theconstruct.ai/t/exam-wont-load-notebook-terminal-workspace-or-simulation-window/3222 "2020-04-24T16:28:30Z")
This is what I see when I open the Final Exam. It will not load any aspect or let me use any of the final exam. Does opening this still count as one of my tries? --- ## [Stuck, help me. How to publish the empty when do the empty services](https://get-help.theconstruct.ai/t/stuck-help-me-how-to-publish-the-empty-when-do-the-empty-services/3166)
**Author:** [@billy.nugraha.s](https://get-help.theconstruct.ai/u/billy.nugraha.s)\ **Replies:** 1\ **Last updated:** [April 20, 2020, 8:52am UTC](https://get-help.theconstruct.ai/t/stuck-help-me-how-to-publish-the-empty-when-do-the-empty-services/3166 "2020-04-20T08:52:22Z")
Hi, i got stuck here. I want to publish drone to takeoff, i define this : pub\_takeoff = rospy.Publisher('/drone/takeoff', Empty, queue\_size=1) when i do the services using rospy.Service('/my\_service', Empty, my\_callbac… --- ## [Result not justified](https://get-help.theconstruct.ai/t/result-not-justified/2158)
**Author:** [@hrushikesh.kyathari](https://get-help.theconstruct.ai/u/hrushikesh.kyathari)\ **Replies:** 4\ **Last updated:** [February 17, 2020, 10:34am UTC](https://get-help.theconstruct.ai/t/result-not-justified/2158 "2020-02-17T10:34:42Z")
My codes for the final exam were right and accurate but I really don’t think I deserve a grade ‘5’ for my codes. Kindly look into the grading. --- ## [Giving additional attempts for examinations if ROS developers volunteer to tutor fellow developers online in ROS courses real time](https://get-help.theconstruct.ai/t/giving-additional-attempts-for-examinations-if-ros-developers-volunteer-to-tutor-fellow-developers-online-in-ros-courses-real-time/1596)
**Author:** [@ohgheeling80](https://get-help.theconstruct.ai/u/ohgheeling80)\ **Replies:** 1\ **Last updated:** [November 30, 2019, 7:43pm UTC](https://get-help.theconstruct.ai/t/giving-additional-attempts-for-examinations-if-ros-developers-volunteer-to-tutor-fellow-developers-online-in-ros-courses-real-time/1596 "2019-11-30T19:43:20Z")
Hi, I would like to appeal for ROS team to consider signing up ROS developers as tutors .These tutors can technical support real time when they are online to answer queries by other ROS developers having problems. In r… --- ## [I want schedual the final exam a month later](https://get-help.theconstruct.ai/t/i-want-schedual-the-final-exam-a-month-later/1278)
**Author:** [@trevorsebastien7](https://get-help.theconstruct.ai/u/trevorsebastien7)\ **Replies:** 1\ **Last updated:** [November 20, 2019, 10:26am UTC](https://get-help.theconstruct.ai/t/i-want-schedual-the-final-exam-a-month-later/1278 "2019-11-20T10:26:46Z")
Hello, I bought a month subscription and intended to finish the exam when my subscription ended. However, because of my increased obligations I need more time to learn the material on my own. is there any chance that I …