[Mastering Mobile Manipulators] simple_grasping package error

I am Ubuntu 18.04 + ROS Melodic user.
I tried to follow the tutorial at my own computer, the package gots error.
Thank you in advance. :slight_smile:

Hello @hki,

As the error message indicates, you are missing the grasping_msgs package in your workspace. You should download and compile the Melodic version of this package, since it is needed by other packages.