# Latest **URL:** https://get-help.theconstruct.ai/latest.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) --- ## [Welcome to The Construct ROS Community!](https://get-help.theconstruct.ai/t/welcome-to-the-construct-ros-community/7)
**Author:** [@system](https://get-help.theconstruct.ai/u/system)\ **Replies:** 0\ **Last updated:** [July 15, 2019, 12:08pm UTC](https://get-help.theconstruct.ai/t/welcome-to-the-construct-ros-community/7 "2019-07-15T12:08:56Z")
Welcome to the ROS community of The Construct! This is a community of robotics developers where you can: Get and give help on using ROS for robotics. Take your ROS skills to the next level and/or display it for the wor… --- ## [Code in Unit 6.2 section will not compile due to x\_position being private](https://get-help.theconstruct.ai/t/code-in-unit-6-2-section-will-not-compile-due-to-x-position-being-private/42843)
**Author:** [@zaf1096](https://get-help.theconstruct.ai/u/zaf1096)\ **Replies:** 1\ **Last updated:** [October 13, 2026, 1:54pm UTC](https://get-help.theconstruct.ai/t/code-in-unit-6-2-section-will-not-compile-due-to-x-position-being-private/42843 "2026-10-13T13:54:27Z")
Code below from section "Accessing attributes and methods: the dot ." in Unit 6.2 needs one change. first\_robot.x\_position should be changed to first\_robot.set\_position(1.15) so that a method reaches the private member x… --- ## [Gazebo Launches in Graphical Tool Error](https://get-help.theconstruct.ai/t/gazebo-launches-in-graphical-tool-error/42808)
**Author:** [@malcolm-maurice.holm](https://get-help.theconstruct.ai/u/malcolm-maurice.holm)\ **Replies:** 3\ **Last updated:** [October 13, 2026, 1:17pm UTC](https://get-help.theconstruct.ai/t/gazebo-launches-in-graphical-tool-error/42808 "2026-10-13T13:17:43Z")
I launch Gazebo using a launch file in ros2 humble, but then the Gazebo window opens in the graphical tool window rather than in the simulation window. Unsure off what the error can be but want it to launch in the Simul… --- ## [Actions Quiz - Robot not reaching odometry area?](https://get-help.theconstruct.ai/t/actions-quiz-robot-not-reaching-odometry-area/42748)
**Author:** [@imsandjuan](https://get-help.theconstruct.ai/u/imsandjuan)\ **Replies:** 3\ **Last updated:** [October 5, 2026, 2:39pm UTC](https://get-help.theconstruct.ai/t/actions-quiz-robot-not-reaching-odometry-area/42748 "2026-10-05T14:39:59Z")
Hi, I would like to ask for some feedback respecting the 7.9 Actions Quiz. I ran it “locally” to test my solution and from my perspective it is working as expected because: Robot gets close to flag. Action provides fe… --- ## [What is going on here? almost nothing runs from the terminal](https://get-help.theconstruct.ai/t/what-is-going-on-here-almost-nothing-runs-from-the-terminal/42615)
**Author:** [@UD1](https://get-help.theconstruct.ai/u/UD1)\ **Replies:** 7\ **Last updated:** [September 26, 2026, 5:08am UTC](https://get-help.theconstruct.ai/t/what-is-going-on-here-almost-nothing-runs-from-the-terminal/42615 "2026-09-26T05:08:14Z")
I am just trying to run very basic tools and this is what I am getting. Some “XDG\_RUNTIME\_DIR” error… Please advise. Thank you --- ## [\[Bug\] Exercise Errors](https://get-help.theconstruct.ai/t/bug-exercise-errors/42629)
**Author:** [@Abe\_123](https://get-help.theconstruct.ai/u/Abe_123)\ **Replies:** 1\ **Last updated:** [September 23, 2026, 12:56pm UTC](https://get-help.theconstruct.ai/t/bug-exercise-errors/42629 "2026-09-23T12:56:23Z")
This is an error report. Screenshot of the error Error details There is not enough information for the execrcise to follow, the hyperlink of the flowcharts don't lead to anywhere --- ## [\[Bug\] Package topic\_quiz existant mais non trouvé](https://get-help.theconstruct.ai/t/bug-package-topic-quiz-existant-mais-non-trouve/42649)
**Author:** [@ek-Nelson](https://get-help.theconstruct.ai/u/ek-Nelson)\ **Replies:** 1\ **Last updated:** [September 23, 2026, 12:51pm UTC](https://get-help.theconstruct.ai/t/bug-package-topic-quiz-existant-mais-non-trouve/42649 "2026-09-23T12:51:11Z")
This is an error report. Screenshot of the error Error details Bonjour, Afin de pouvoir valider le quiz, j'ai soumis mon code au bot mais celui-ci ne le trouve pas pourtant le package a bien le bon nom ("topic\_quiz… --- ## [Urgent restore request for accidentally deleted Rosject – STAIRS2 Demo v1](https://get-help.theconstruct.ai/t/urgent-restore-request-for-accidentally-deleted-rosject-stairs2-demo-v1/42620)
**Author:** [@kshardy1214](https://get-help.theconstruct.ai/u/kshardy1214)\ **Replies:** 10\ **Last updated:** [September 23, 2026, 11:42am UTC](https://get-help.theconstruct.ai/t/urgent-restore-request-for-accidentally-deleted-rosject-stairs2-demo-v1/42620 "2026-09-23T11:42:59Z")
Hi The Construct Support, I accidentally deleted a Rosject from my personal account today, September 19, 2026, and the deletion also caused my original private master Rosject named STAIRS2 Demo v1 to disappear. I need … --- ## [Grade Bot Fails because of failed Build](https://get-help.theconstruct.ai/t/grade-bot-fails-because-of-failed-build/42585)
**Author:** [@malcolm-maurice.holm](https://get-help.theconstruct.ai/u/malcolm-maurice.holm)\ **Replies:** 4\ **Last updated:** [September 21, 2026, 10:43am UTC](https://get-help.theconstruct.ai/t/grade-bot-fails-because-of-failed-build/42585 "2026-09-21T10:43:07Z")
When I run Colcon build my applications build succeeds but once I submit my Quiz for evaluation the Grade Bot fails because of a build error. If I then run Colcon build my application throughs errors and is unable to bui… --- ## [Moveit\_rviz not launching graphical interface](https://get-help.theconstruct.ai/t/moveit-rviz-not-launching-graphical-interface/42494)
**Author:** [@sheryl](https://get-help.theconstruct.ai/u/sheryl)\ **Replies:** 6\ **Last updated:** [September 18, 2026, 5:27pm UTC](https://get-help.theconstruct.ai/t/moveit-rviz-not-launching-graphical-interface/42494 "2026-09-18T17:27:22Z")
Hi all, I just started teh ROS2 manipulation basics course and when running the second shell commands source /home/simulations/ros2\_sims\_ws/install/setup.bash ros2 launch test\_moveit\_config moveit\_rviz.launch.py no gra… --- ## [\[Bug\] text error](https://get-help.theconstruct.ai/t/bug-text-error/42586)
**Author:** [@Abe\_123](https://get-help.theconstruct.ai/u/Abe_123)\ **Replies:** 1\ **Last updated:** [September 18, 2026, 5:24pm UTC](https://get-help.theconstruct.ai/t/bug-text-error/42586 "2026-09-18T17:24:26Z")
This is an error report. Screenshot of the error Error details Exercise 2.3.a: the instruction meant to be positions 0, 49, and 99 not positions 0, 360, 719. --- ## [\[Bug\] mis information](https://get-help.theconstruct.ai/t/bug-mis-information/42584)
**Author:** [@Abe\_123](https://get-help.theconstruct.ai/u/Abe_123)\ **Replies:** 1\ **Last updated:** [September 18, 2026, 5:24pm UTC](https://get-help.theconstruct.ai/t/bug-mis-information/42584 "2026-09-18T17:24:18Z")
This is an error report. Screenshot of the error Error details In 2.1.1 Code explanation in Python for Robotics, it explains the range of the laser beams is 180 degrees in couple of places but it is actually mea… --- ## [\[Bug\] command python3 intro\_rag.py results in error](https://get-help.theconstruct.ai/t/bug-command-python3-intro-rag-py-results-in-error/42537)
**Author:** [@Haroon02](https://get-help.theconstruct.ai/u/Haroon02)\ **Replies:** 4\ **Last updated:** [September 16, 2026, 8:34pm UTC](https://get-help.theconstruct.ai/t/bug-command-python3-intro-rag-py-results-in-error/42537 "2026-09-16T20:34:56Z")
This is an error report. Screenshot of the error Error details as i run it it tries to downnload the embedding from the google cloud and everything but it doesnt work and i cant move forward in this course so help … --- ## [City Lab Real Robot not moving](https://get-help.theconstruct.ai/t/city-lab-real-robot-not-moving/42541)
**Author:** [@fra\_gra](https://get-help.theconstruct.ai/u/fra_gra)\ **Replies:** 2\ **Last updated:** [September 15, 2026, 9:36am UTC](https://get-help.theconstruct.ai/t/city-lab-real-robot-not-moving/42541 "2026-09-15T09:36:05Z")
I was connected to the real robot lab for the course project, but the physical robot did not move; i Tried using both the keyboard teleop tool and the on-screen joystick in the UI, but the physical robot remained comple… --- ## [Please restore from backup](https://get-help.theconstruct.ai/t/please-restore-from-backup/42527)
**Author:** [@danielmanu](https://get-help.theconstruct.ai/u/danielmanu)\ **Replies:** 2\ **Last updated:** [September 14, 2026, 10:42am UTC](https://get-help.theconstruct.ai/t/please-restore-from-backup/42527 "2026-09-14T10:42:48Z")
Hi, I accidentally deleted my linux\_basics\_project. I mean the linux\_basics\_project folder in the Linux Course rosject. I had several customised scripts there that were very important. Could you please restore it from t… --- ## [\[BUG\] 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… --- ## [Rtabmap package disappearing](https://get-help.theconstruct.ai/t/rtabmap-package-disappearing/42458)
**Author:** [@Mexperseiu](https://get-help.theconstruct.ai/u/Mexperseiu)\ **Replies:** 2\ **Last updated:** [September 8, 2026, 8:03am UTC](https://get-help.theconstruct.ai/t/rtabmap-package-disappearing/42458 "2026-09-08T08:03:20Z")
In my private rosject, I need to use Rtabmap. Every time i logout, and some time have passed (about 15 min), and I login back again, the package disappears and i have to reinstall it again. How can I fix/solve this. --- ## [Urgent: Accidentally deleted my src files for a school project](https://get-help.theconstruct.ai/t/urgent-accidentally-deleted-my-src-files-for-a-school-project/42422)
**Author:** [@Mexperseiu](https://get-help.theconstruct.ai/u/Mexperseiu)\ **Replies:** 3\ **Last updated:** [September 7, 2026, 1:20pm UTC](https://get-help.theconstruct.ai/t/urgent-accidentally-deleted-my-src-files-for-a-school-project/42422 "2026-09-07T13:20:43Z")
Hi, I accidentally deleted a private my src folder files in my rosject for an urgent school project (name: Exploration\_drone\_rl). It is urgent due to time. Can I get a previous version restored? @bayodesegun --- ## [Disconnected BB8 simulation](https://get-help.theconstruct.ai/t/disconnected-bb8-simulation/42274)
**Author:** [@Blitz](https://get-help.theconstruct.ai/u/Blitz)\ **Replies:** 9\ **Last updated:** [September 5, 2026, 10:30pm UTC](https://get-help.theconstruct.ai/t/disconnected-bb8-simulation/42274 "2026-09-05T22:30:38Z")
The simulation window on the top right seems to never connected. It will say connecting for a second and then go back to disconnected status. Of course, no command from the terminal is working either. I’m not sure what t… --- ## [Fastbot is not reponsive](https://get-help.theconstruct.ai/t/fastbot-is-not-reponsive/42404)
**Author:** [@timix295](https://get-help.theconstruct.ai/u/timix295)\ **Replies:** 2\ **Last updated:** [September 4, 2026, 1:31pm UTC](https://get-help.theconstruct.ai/t/fastbot-is-not-reponsive/42404 "2026-09-04T13:31:49Z")
I tried to connect to the Fast Bot but it is not moving. It does not respond to the controls of both the joystick and the teleoperated control for the project. This has occurred since yesterday. Please let this be fixed --- ## [I accidentally deleted my src](https://get-help.theconstruct.ai/t/i-accidentally-deleted-my-src/42416)
**Author:** [@Robos\_Bizzare\_Adventure](https://get-help.theconstruct.ai/u/Robos_Bizzare_Adventure)\ **Replies:** 1\ **Last updated:** [September 4, 2026, 1:23pm UTC](https://get-help.theconstruct.ai/t/i-accidentally-deleted-my-src/42416 "2026-09-04T13:23:54Z")
I am currently in section 2, ROS2 Basic concepts, of the course ROS2 Basics in 5 days (python). I accidentally deleted ~/ros2\_ws/src. Is there any method of undoing this or restoring an older version? Thanks. --- ## [\[Bug\] Storage full](https://get-help.theconstruct.ai/t/bug-storage-full/42372)
**Author:** [@dcovello274](https://get-help.theconstruct.ai/u/dcovello274)\ **Replies:** 5\ **Last updated:** [September 4, 2026, 5:16am UTC](https://get-help.theconstruct.ai/t/bug-storage-full/42372 "2026-09-04T05:16:21Z")
This is an error report. Screenshot of the error Error details Do I need to do previous courses to clear storage space. I'm not sure how to do presentations, so I plan to learn OBS Studio before wrapping up the rob… --- ## [C++ for Robotics Rosject](https://get-help.theconstruct.ai/t/c-for-robotics-rosject/42370)
**Author:** [@dcovello274](https://get-help.theconstruct.ai/u/dcovello274)\ **Replies:** 4\ **Last updated:** [September 3, 2026, 3:02pm UTC](https://get-help.theconstruct.ai/t/c-for-robotics-rosject/42370 "2026-09-03T15:02:08Z")
I completed the course, but I don’t see a copy in my Rosjects folder like I did for Linux for Robotics & Python for Robotics. Now what? --- ## [\[Bug\] ros2 launch not working](https://get-help.theconstruct.ai/t/bug-ros2-launch-not-working/42390)
**Author:** [@dotLumen](https://get-help.theconstruct.ai/u/dotLumen)\ **Replies:** 2\ **Last updated:** [September 3, 2026, 10:23am UTC](https://get-help.theconstruct.ai/t/bug-ros2-launch-not-working/42390 "2026-09-03T10:23:15Z")
This is an error report. Screenshot of the error Error details ros2 launch not working --- ## [Title: Accidentally overwrote simple\_patrol.bash file in Linux Basics](https://get-help.theconstruct.ai/t/title-accidentally-overwrote-simple-patrol-bash-file-in-linux-basics/42392)
**Author:** [@Rave](https://get-help.theconstruct.ai/u/Rave)\ **Replies:** 2\ **Last updated:** [September 2, 2026, 10:40pm UTC](https://get-help.theconstruct.ai/t/title-accidentally-overwrote-simple-patrol-bash-file-in-linux-basics/42392 "2026-09-02T22:40:37Z")
Body: Hi, I’m working on the “Linux Basics for Robotics” rosject (Part 2 — Create Programs to Control the Robot). While trying to move two provided files (robot\_interface.py and simple\_patrol.bash) from ~/ros2\_ws/src/ … --- ## [\[Bug\] Doesn't copy to Rosject](https://get-help.theconstruct.ai/t/bug-doesnt-copy-to-rosject/42371)
**Author:** [@dcovello274](https://get-help.theconstruct.ai/u/dcovello274)\ **Replies:** 2\ **Last updated:** [September 1, 2026, 3:39am UTC](https://get-help.theconstruct.ai/t/bug-doesnt-copy-to-rosject/42371 "2026-09-01T03:39:59Z")
This is an error report. Screenshot of the error Error details There's no copy of C++ for Robotics in My Rosjects, so what am I doing wrong. I already have Linux for Robotics & Python for Robotics there, but don't … --- ## [Quiz 3.10 /odom bug Gradbot](https://get-help.theconstruct.ai/t/quiz-3-10-odom-bug-gradbot/42355)
**Author:** [@hugo.turlet](https://get-help.theconstruct.ai/u/hugo.turlet)\ **Replies:** 6\ **Last updated:** [September 1, 2026, 1:12am UTC](https://get-help.theconstruct.ai/t/quiz-3-10-odom-bug-gradbot/42355 "2026-09-01T01:12:36Z")
Hi there, I’ve done the quiz in the 5days ros2 in python, part 3.10, but on 3 trials the bot told me I’m not subscribed to /ododm which I am in fact. My robot is working correctly, reaching the position in far less tha… --- ## [Get access to perception (laser / camera) on warehouse UR3e](https://get-help.theconstruct.ai/t/get-access-to-perception-laser-camera-on-warehouse-ur3e/42359)
**Author:** [@ioana.calangiu](https://get-help.theconstruct.ai/u/ioana.calangiu)\ **Replies:** 1\ **Last updated:** [August 31, 2026, 12:10pm UTC](https://get-help.theconstruct.ai/t/get-access-to-perception-laser-camera-on-warehouse-ur3e/42359 "2026-08-31T12:10:33Z")
Hi, I’m working with the UR3e warehouse arm, and I’m trying to get camera/perception input into my code. What I can confirm works: Full arm control via the standard driver topics/actions (/joint\_states, /scaled\_join… --- ## [Rviz not opening on the Linux for Robotics Rosject](https://get-help.theconstruct.ai/t/rviz-not-opening-on-the-linux-for-robotics-rosject/42360)
**Author:** [@officercrafter1005](https://get-help.theconstruct.ai/u/officercrafter1005)\ **Replies:** 1\ **Last updated:** [August 31, 2026, 10:35am UTC](https://get-help.theconstruct.ai/t/rviz-not-opening-on-the-linux-for-robotics-rosject/42360 "2026-08-31T10:35:49Z")
I’m trying to learn Linux for Robotics and the project that comes with the course is not behaving as the course book says. The Gazebo simulation did open, but Rviz is not opening and my terminal seems to get an error. H… --- ## [Final Project Simulation Not Running](https://get-help.theconstruct.ai/t/final-project-simulation-not-running/42291)
**Author:** [@mariamessam521cs](https://get-help.theconstruct.ai/u/mariamessam521cs)\ **Replies:** 4\ **Last updated:** [August 26, 2026, 5:54pm UTC](https://get-help.theconstruct.ai/t/final-project-simulation-not-running/42291 "2026-08-26T17:54:28Z")
Hello whenever i try to run this command: source ~/simulation\_ws/install/setup.bash ros2 launch turtlebot3\_gazebo main\_turtlebot3\_lab.launch.xml it gives me this error in the terminal and i am unable to start working o… [Next page](https://get-help.theconstruct.ai/latest.md?page=1)