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Hello Suchi Sundaram!, I also came across the same problem while using hrwros packages. I found the solution to run this package in melodic. I tested and ran in melodic ros version.

Basically, hrwros packages are using Universal Robot's model in their simulation. Follow this link, https://github.com/ros-industrial/universal_robot/tree/melodic-devel

You have to source install package as instructed in above link, but you will see this error

hrwros_support: Cannot locate rosdep definition for [turtlebot_description]

This error simply implies that in folder there is no package of turtlebot. So you need to once again source this package in your workspace folder as you did for universal robot above. For that follow this code

cd hrwros_ws/src
git clone -b melodic https://github.com/turtlebot/turtlebot.git
cd ..
catkin_make

If you get invoke with 'cmake' failed, for package configuration "joy" Follow this command to solve

sudo apt-get install ros-melodic-joy*

After following this steps. Run your script command, and it would successfull launch.