"roslaunch blue_bringup rviz.launch" not running.

[yusukeurakami]

It is saying "Robot model parameter not found! Did you remap 'robot_description'?"

I try replaced the "robot_description" in blue.rviz into "blue_description" but did not help.
It seems like ros cannot load robot model. Do I need to run other rosrun before running this?

FYI. I am using following setting.
OS: Ubuntu 18.04
ROS dist: Melodic