[Bug] Succeeded but Gradebot says not subscribed

Course Support ROS2 Basics in 5 Days Humble (C++)
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This is an error report.

Screenshot of the error

error_image_2d5ad414-0d33-4750-9bca-52b87b010421_1706322081819.jpg1897Ă—926 394 KB

Error details

Helllo, I followed every specifications (file name, topic name) and the robot moved correctly: avoid the sphere and move forward). But Gradebot says that it didnt subscribe from /scan topic. Could you tell me what is wrong here?

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helpforunit3-7quiz
helpforunit3-7quiz1816Ă—1095 181 KB

I had checked “topic info” while the programme running and it subscribs as shown.
Does anyone else have the same problem and know of a solution?

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From what you shared here, the name of your node was incorrect:

  • The name of the node was supposed to be topics_quiz_node, but you named it avoid_sphere.
  • This grader suggested this to you in its feedback, and you didn’t act on it:

âś– [20:12:16] [assess] Not subscribed to /scan. I had big plans for this!
- Did you create a subscriber correctly to the topic /scan in your source code?
- Did you name your node correctly in the C++ source? It should be topics_quiz_node (mark: 4.0)

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