---
title: "Discussion on \"Bug of the week #9\" | Hashnode"
description: "Discussion on \"Bug of the week #9\". Welcome to the next pikoTutorial!\nThe error we're handling today is a ROS runtime error:\nThe message type 'X' is invalid\nTypically occurring when calling commands like:\nros2 topic echo /topic_name\n\nWhat does it mean?\nTo understand where does this err..."
url: "https://hashnode.com/posts/bug-of-the-week-9/688f0909435bf3630e99b184"
---

[Feed](https://hashnode.com/feed) /

Discussion

# [Bug of the week #9](https://pikotutorial.hashnode.dev/bug-of-the-week-9?utm_source=hashnode&utm_medium=feed)

Welcome to the next pikoTutorial! The error we're handling today is a ROS runtime error: The message type 'X' is invalid Typically occurring when calling commands like: ros2 topic echo /topic\_name What does it mean? To understand where does this err...

Aug 3, 2025 · 1 min read · pikotutorial.hashnode.dev  
Read the article

-   [#ros](https://hashnode.com/tag/ros)
-   [#ros2](https://hashnode.com/tag/ros2)
-   [#pikotutorial](https://hashnode.com/tag/pikotutorial)
-   [#bugs-and-errors](https://hashnode.com/tag/bugs-and-errors)

## Written by

[pikoTutorial](https://hashnode.com/@pikotutorial)

@pikotutorial

  
[View profile](https://hashnode.com/@pikotutorial)

## Responses

Markdown supported · ⌘↵ to post

No responses yet.