Error with duckietown_msgs

Hello, I was trying to implement simulation_ws of the DuckieTown-class 30 on my local machine. When I compile it, there was an error with “Cannot locate rosdep definition for [duckietown_msgs]”. I see that there is a folder “duckietown_msgs” provided (with Cmakefiles). What should I do with it in order to resolve this error??

Thanks

I copied the duckietown_msgs folder from the git, and it is ok now!