roslaunch [ ] is neither a launch file in package [ ] nor is [ ] a launch file name

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I am trying to use a package I found on github in order to play around gazebo and ROS. I found this project and I followed every single step:

1. Installed Ubuntu Focal 20.04
2. Installed ROS Noetic (which automatically installs Gazebo as well)
3. Installed Opencv-python 4.2.0.34
4. Created a catkin workspace following this guide
5. Cloned the repo into /src/ directory
6. Ran the catkin_make command in order to "build" the project

Given this, I'm able to run the roscore command and every other command written in the github guide (even the pythin script) besides roslaunch my2wr gazebo.launch which generates an error.

It warns me about the aws_robomaker_racetrack_world file / directory, but I don't know what to do. I already browsed some other guides in this forum and they were mainly fixed using the source commands, but I tried it myself and it didn't work as well. Is there any issue with the github guide itself or am I doing something wrong here??