Cannot visualise the map in Rviz2

[Narayan-007]

I have managed to create a basic environment to launch in Gazebo using RMF Traffic Editor. It can be seen below:

However, when I look at the Rviz2 visualiser, I am not able to see the map inside. It looks like this:

This are the links to the gists that I have created to include the files I have used for this, as well as the messages I got when I launched the files:
Messages I got from the files I launched: https://gist.github.com/Narayan-007/cade8f0ca78fad2c0299174b5103b029
Files used for this: https://gist.github.com/Narayan-007/dfee0e2b6921d9977c7b73f84159c0cd

I also want to mention that during this process, I was not able to generate the .rviz file as I do not know how to generate one using the .yaml file that was created by the RMF Traffic Editor. I was not able to find the steps online, as well as the Robot Fleet Management course in The Construct, if you have heard of it or are familiar with it. What can be the possible solutions for this issue?

This is the map image I used for the creation of the environment using RMF Traffic Editor: