I’m trying to solve the exercise 3.3 where I have to create a publisher to publish age of robot using custom message format. I followed the instructions to create the Age.msg and aslo added the necessary lines to CMakeLists.txt and package.xml. When I start the node the topic can be seen in rostopi…

Hi @akshay.ulavan , Welcome to the Community! For solving this problem, please have a look at this post: [image] ERROR: Cannot load message class for [package/Message]. Are your messages built? Course Support …

Thanks @bayodesegun I am really enjoying the course :grinning: My issue was as mentioned in the post #3. I didn’t understand it the first time. But I realized that I hadn’t done source devel/setup.bash in shell 2 where I was running the command rostopic echo. Thanks for the quick response!

ERROR: Cannot load message class for [my_examples_pkg/Age]. Are your messages built? Exercise 3.3

Course Support ROS Basics In 5 Days (Python)

bayodesegun October 27, 2020, 9:30am 2

Hi @akshay.ulavan,

Welcome to the Community!

For solving this problem, please have a look at this post: