Could not load resource file

I am following the instructions of the course Merging sensor data on a personal computer. But when I followed the course instructions, I ran the roslaunch realrobot main.launch and rviz commands on the turtlebot3 robot. I got an error with Rviz as shown below. I’ve also seen a few people have the same situation, I followed and it didn’t work. For example, 1 question below:

My rviz:

It looks like you haven’t installed the turtlebot3_description package. You need to install it

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