# Quiz grade doesn't load

**URL:** <https://get-help.theconstruct.ai/t/quiz-grade-doesnt-load/4326>\
**Category:** ROS Basics In 5 Days (Python)\
**Tags:** quiz\
**Created:** [July 7, 2020, 9:11pm UTC](https://get-help.theconstruct.ai/t/quiz-grade-doesnt-load/4326 "2020-07-07T21:11:23Z")\
**Posts on this page:** 1\
**Showing post:** 6

<div class="post-metadata">

**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:** [July 9, 2020, 1:03pm UTC](https://get-help.theconstruct.ai/t/quiz-grade-doesnt-load/4326/6 "2020-07-09T13:03:14Z")

</div>

@phadjian,

I have checked your code.

On the last line of your service client code, you have:

```auto
rospy.spin()

```

This causes the service client to run forever, after finishing the calls. I commented this line out and was able to complete the submission for you. You may try submitting it again to verify.

Read about `rospy.spin()` here: [What is rospy.spin(), ros::spin(), ros::spinOnce(), and what are they for?](https://get-help.robotigniteacademy.com/t/what-is-rospy-spin-ros-spin-ros-spinonce-and-what-are-they-for/58)

Cheers,

**PS:**

1. Actually that step where it’s getting stucks takes some time, because that’s where the robot is performing the squares, so give it some time (go grab a coffee 🙂).
2. Ensure nothing is running in the shell before starting the autocorrection.

---

_[View the full topic](https://get-help.theconstruct.ai/t/quiz-grade-doesnt-load/4326)._