# Services quiz in ros in 5 days

**URL:** <https://get-help.theconstruct.ai/t/services-quiz-in-ros-in-5-days/264>\
**Category:** ROS Basics In 5 Days (Python)\
**Created:** [August 6, 2019, 4:18pm UTC](https://get-help.theconstruct.ai/t/services-quiz-in-ros-in-5-days/264 "2019-08-06T16:18:18Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**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:** [August 6, 2019, 6:55pm UTC](https://get-help.theconstruct.ai/t/services-quiz-in-ros-in-5-days/264/2 "2019-08-06T18:55:24Z")

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Hey @miryalkar.ashish1234,

Please check the hints in this post and let us know if it helps.

> **[ERROR: Cannot load message class for \[package/Message\]. Are your messages built?](https://get-help.theconstruct.ai/t/error-cannot-load-message-class-for-package-message-are-your-messages-built/55)**
>
> This error usually happens when you create a custom ROS message. SOLUTION: Please check the following in order. Painfully 🙂, #3 is a common and repeated cause, and it tends to happen even if you already know about it! Have you made the...

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