Hi @helpteye
This message is because you did not install the [turtlebot3_fake](
https://github.com/ROBOTIS-GIT/turtlebot3_simulations) package.
The related packages are described in the following links and how to use them. :slight_smile:
http://turtlebot3.robotis.com/en/latest/simulation.html
Thanks,
Pyo
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