Unable to launch a gazebo model

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Hi!

I am totally newbie to the ROS world. I am working on my final year project that involves indoor mapping via quadcopter. I had a very hard time starting with ROS.

Now that I have installed ROS Noetic successfully, I am facing an issue while launching a gazebo file. I am following the instructions in this repo on GitHub: https://github.com/lemontyc/my_robot

I have cloned the repo inside the src folder, and have installed the packages, but when I run this command: roslaunch my_robot world. launch

It says: RLException: [my_robot] is neither a launch file in package [gazebo_ros] nor is [gazebo_ros] a launch file name The traceback for the exception was written to the log file

There might be a simple fix, but since I am new I know nothing. Please help!